[gtk+] Use appropriate const declaration for static strings

[Emmanuele Bassi <ebassi src gnome org>]

commit 137e1aa9889c1eb3e692fc963bfa1ffaff28ae6b
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Oct 14 19:33:53 2016 +0100

    Use appropriate const declaration for static strings

 gtk/a11y/gtkaccessibility.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/a11y/gtkaccessibility.c b/gtk/a11y/gtkaccessibility.c
index a879627..021f828 100644
--- a/gtk/a11y/gtkaccessibility.c
+++ b/gtk/a11y/gtkaccessibility.c
@@ -801,7 +801,7 @@ state_event_watcher (GSignalInvocationHint *hint,
   AtkObject *atk_obj;
   AtkObject *parent;
   GdkEventWindowState *event;
-  gchar *signal_name;
+  const char *signal_name;
 
   object = g_value_get_object (param_values + 0);
   if (!GTK_IS_WINDOW (object))
@@ -846,7 +846,7 @@ configure_event_watcher (GSignalInvocationHint *hint,
   AtkObject *atk_obj;
   AtkObject *parent;
   GdkEvent *event;
-  gchar *signal_name;
+  const char *signal_name;
 
   object = g_value_get_object (param_values + 0);
   if (!GTK_IS_WINDOW (object))