[libsecret/wip/nielsdg/null-terminated-annotations] Use G_GNUC_NULL_TERMINATED where appropriate

[Niels De Graef <nielsdg src gnome org>]

commit 7e3c56ba1ef20d10d0dc3126d3d52d5c4fef5517
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sat Feb 6 11:44:49 2021 +0100

    Use G_GNUC_NULL_TERMINATED where appropriate
    
    Give our API consumers an extra hint if they're using varargs without an
    appropriate `NULL`-sentinel.

 libsecret/secret-attributes.h |  2 +-
 libsecret/secret-password.h   | 34 +++++++++++++++++-----------------
 2 files changed, 18 insertions(+), 18 deletions(-)
---
diff --git a/libsecret/secret-attributes.h b/libsecret/secret-attributes.h
index 43e6035..5ec1931 100644
--- a/libsecret/secret-attributes.h
+++ b/libsecret/secret-attributes.h
@@ -27,7 +27,7 @@
 G_BEGIN_DECLS
 
 GHashTable *         secret_attributes_build         (const SecretSchema *schema,
-                                                      ...);
+                                                      ...) G_GNUC_NULL_TERMINATED;
 
 GHashTable *         secret_attributes_buildv        (const SecretSchema *schema,
                                                       va_list va);
diff --git a/libsecret/secret-password.h b/libsecret/secret-password.h
index 0719317..2c61483 100644
--- a/libsecret/secret-password.h
+++ b/libsecret/secret-password.h
@@ -46,13 +46,13 @@ void         secret_password_storev                    (const SecretSchema *sche
                                                         gpointer user_data);
 
 void         secret_password_store_binary              (const SecretSchema *schema,
-                                                       const gchar *collection,
-                                                       const gchar *label,
-                                                       SecretValue *value,
-                                                       GCancellable *cancellable,
-                                                       GAsyncReadyCallback callback,
-                                                       gpointer user_data,
-                                                       ...);
+                                                        const char *collection,
+                                                        const char *label,
+                                                        SecretValue *value,
+                                                        GCancellable *cancellable,
+                                                        GAsyncReadyCallback callback,
+                                                        gpointer user_data,
+                                                        ...) G_GNUC_NULL_TERMINATED;
 
 void         secret_password_storev_binary             (const SecretSchema *schema,
                                                        GHashTable *attributes,
@@ -83,12 +83,12 @@ gboolean     secret_password_storev_sync               (const SecretSchema *sche
                                                         GError **error);
 
 gboolean     secret_password_store_binary_sync         (const SecretSchema *schema,
-                                                       const gchar *collection,
-                                                       const gchar *label,
-                                                       SecretValue *value,
-                                                       GCancellable *cancellable,
-                                                       GError **error,
-                                                       ...);
+                                                        const char *collection,
+                                                        const char *label,
+                                                        SecretValue *value,
+                                                        GCancellable *cancellable,
+                                                        GError **error,
+                                                        ...) G_GNUC_NULL_TERMINATED;
 
 gboolean     secret_password_storev_binary_sync        (const SecretSchema *schema,
                                                        GHashTable *attributes,
@@ -126,11 +126,11 @@ gchar *      secret_password_lookup_sync               (const SecretSchema *sche
 gchar *      secret_password_lookup_nonpageable_sync   (const SecretSchema *schema,
                                                         GCancellable *cancellable,
                                                         GError **error,
-                                                        ...);
+                                                        ...) G_GNUC_NULL_TERMINATED;
 SecretValue *secret_password_lookup_binary_sync        (const SecretSchema *schema,
-                                                       GCancellable *cancellable,
-                                                       GError **error,
-                                                       ...);
+                                                        GCancellable *cancellable,
+                                                        GError **error,
+                                                        ...) G_GNUC_NULL_TERMINATED;
 
 gchar *      secret_password_lookupv_sync              (const SecretSchema *schema,
                                                         GHashTable *attributes,