[libgit2-glib] Fix clone example for new credentials signature

[Jesse van den Kieboom <jessevdk src gnome org>]

commit baccda63e8786124760277ef95b121ad3de407dc
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Wed Dec 24 10:05:26 2014 +0100

    Fix clone example for new credentials signature

 examples/clone.c |   25 ++++++++++++++++---------
 1 files changed, 16 insertions(+), 9 deletions(-)
---
diff --git a/examples/clone.c b/examples/clone.c
index 9cd891a..9bad2a4 100644
--- a/examples/clone.c
+++ b/examples/clone.c
@@ -66,23 +66,25 @@ chomp (gchar *s)
        }
 }
 
-static gboolean
+static GgitCred *
 cloner_credentials (GgitRemoteCallbacks  *callbacks,
                     const gchar          *url,
                     const gchar          *username_from_url,
                     guint                 allowed_types,
-                    GgitCred            **cred,
                     GError              **error)
 {
        gchar username[128];
        gchar password[128];
        struct termios old, new;
+       GgitCred *cred;
+
+       g_return_val_if_fail (error != NULL && *error == NULL, NULL);
 
        g_printf ("Username: ");
 
        if (fgets (username, sizeof (username) - 1, stdin) == NULL)
        {
-               return FALSE;
+               return NULL;
        }
 
        g_printf ("Password: ");
@@ -90,7 +92,7 @@ cloner_credentials (GgitRemoteCallbacks  *callbacks,
 
        if (tcgetattr (STDIN_FILENO, &old) != 0)
        {
-               return FALSE;
+               return NULL;
        }
 
        new = old;
@@ -98,14 +100,14 @@ cloner_credentials (GgitRemoteCallbacks  *callbacks,
 
        if (tcsetattr (STDIN_FILENO, TCSAFLUSH, &new) != 0)
        {
-               return FALSE;
+               return NULL;
        }
 
        if (fgets (password, sizeof (password) - 1, stdin) == NULL)
        {
                tcsetattr (STDIN_FILENO, TCSAFLUSH, &old);
 
-               return FALSE;
+               return NULL;
        }
 
        tcsetattr (STDIN_FILENO, TCSAFLUSH, &old);
@@ -113,14 +115,19 @@ cloner_credentials (GgitRemoteCallbacks  *callbacks,
        chomp (username);
        chomp (password);
 
-       *cred = GGIT_CRED (ggit_cred_plaintext_new (username, password, error));
+       cred = GGIT_CRED (ggit_cred_plaintext_new (username, password, error));
 
        if (*error != NULL)
        {
-               return FALSE;
+               if (cred != NULL)
+               {
+                       g_object_unref (cred);
+               }
+
+               return NULL;
        }
 
-       return TRUE;
+       return cred;
 }
 
 static void