[gnome-dictionary] Silence compiler warnings about unused variables

[Emmanuele Bassi <ebassi src gnome org>]

commit b5833c0e75a7d7f1e67c87aadacde1277ec4d214
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Apr 11 11:23:41 2017 +0100

    Silence compiler warnings about unused variables

 libgdict/gdict-database-chooser-button.c |    8 ++++----
 libgdict/gdict-defbox.c                  |    6 +++---
 libgdict/gdict-utils.c                   |    6 +-----
 3 files changed, 8 insertions(+), 12 deletions(-)
---
diff --git a/libgdict/gdict-database-chooser-button.c b/libgdict/gdict-database-chooser-button.c
index e9efa63..fbdb191 100644
--- a/libgdict/gdict-database-chooser-button.c
+++ b/libgdict/gdict-database-chooser-button.c
@@ -313,11 +313,12 @@ gdict_database_chooser_button_clicked (GtkButton *button)
 
   if (active && !priv->is_loaded)
     {
+      context = gdict_database_chooser_get_context (GDICT_DATABASE_CHOOSER (priv->db_chooser));
+
       gtk_stack_set_visible_child_name (GTK_STACK (priv->stack), "spinner");
 
-      if (!priv->start_id)
+      if (priv->start_id == 0)
        {
-         context = gdict_database_chooser_get_context (GDICT_DATABASE_CHOOSER (priv->db_chooser));
          priv->start_id = g_signal_connect (context, "database-lookup-start",
                                             G_CALLBACK (lookup_start_cb),
                                             chooser_button);
@@ -326,7 +327,7 @@ gdict_database_chooser_button_clicked (GtkButton *button)
                                           chooser_button);
        }
 
-      if (!priv->error_id)
+      if (priv->error_id == 0)
        priv->error_id = g_signal_connect (context, "error",
                                           G_CALLBACK (error_cb),
                                           chooser_button);
@@ -697,7 +698,6 @@ gdict_database_chooser_button_set_current_database (GdictDatabaseChooserButton *
 {
   GdictDatabaseChooserButtonPrivate *priv =
     gdict_database_chooser_button_get_instance_private (chooser);
-  gboolean valid;
 
   g_return_val_if_fail (GDICT_IS_DATABASE_CHOOSER_BUTTON (chooser), FALSE);
 
diff --git a/libgdict/gdict-defbox.c b/libgdict/gdict-defbox.c
index 8d623be..4f07868 100644
--- a/libgdict/gdict-defbox.c
+++ b/libgdict/gdict-defbox.c
@@ -1091,7 +1091,7 @@ find_prev_clicked_cb (GtkWidget *widget,
   GdictDefbox *defbox = GDICT_DEFBOX (user_data);
   GdictDefboxPrivate *priv = defbox->priv;
   const gchar *text;
-  gboolean found;
+  gboolean found G_GNUC_UNUSED;
 
   text = gtk_entry_get_text (GTK_ENTRY (priv->find_entry));
   if (!text)
@@ -1173,7 +1173,7 @@ find_next_clicked_cb (GtkWidget *widget,
   GdictDefbox *defbox = GDICT_DEFBOX (user_data);
   GdictDefboxPrivate *priv = defbox->priv;
   const gchar *text;
-  gboolean found;
+  gboolean found G_GNUC_UNUSED;
 
   text = gtk_entry_get_text (GTK_ENTRY (priv->find_entry));
   if (!text)
@@ -1195,7 +1195,7 @@ find_entry_changed_cb (GtkWidget *widget,
   GdictDefbox *defbox = GDICT_DEFBOX (user_data);
   GdictDefboxPrivate *priv = defbox->priv;
   gchar *text;
-  gboolean found;
+  gboolean found G_GNUC_UNUSED;
 
   text = gtk_editable_get_chars (GTK_EDITABLE (widget), 0, -1);
   if (!text)
diff --git a/libgdict/gdict-utils.c b/libgdict/gdict-utils.c
index cc33772..45a9ffd 100644
--- a/libgdict/gdict-utils.c
+++ b/libgdict/gdict-utils.c
@@ -106,13 +106,11 @@ pre_parse_hook (GOptionContext  *context,
                 gpointer         data,
                 GError         **error)
 {
-  const char *env_string;
-
   if (gdict_is_initialized)
     return TRUE;
 
 #ifdef GDICT_ENABLE_DEBUG
-  env_string = g_getenv ("GDICT_DEBUG");
+  const char *env_string = g_getenv ("GDICT_DEBUG");
   if (env_string != NULL)
     {
       gdict_debug_flags =
@@ -120,8 +118,6 @@ pre_parse_hook (GOptionContext  *context,
                               gdict_debug_keys,
                               G_N_ELEMENTS (gdict_debug_keys));
     }
-#else
-  env_string = NULL;
 #endif /* GDICT_ENABLE_DEBUG */
 
   return TRUE;