[gtk] picture: Don't use g_str_equal() with potential NULLs

[Benjamin Otte <otte src gnome org>]

commit a34a5df67409974449fa337a2ad3c6302318679e
Author: Benjamin Otte <otte redhat com>
Date:   Sun Jun 10 02:56:18 2018 +0200

    picture: Don't use g_str_equal() with potential NULLs

 gtk/gtkpicture.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkpicture.c b/gtk/gtkpicture.c
index b84ba68e29..3a8970a567 100644
--- a/gtk/gtkpicture.c
+++ b/gtk/gtkpicture.c
@@ -947,7 +947,7 @@ gtk_picture_set_alternative_text (GtkPicture *self,
 {
   g_return_if_fail (GTK_IS_PICTURE (self));
 
-  if (g_str_equal (self->alternative_text, alternative_text))
+  if (g_strcmp0 (self->alternative_text, alternative_text) == 0)
     return;
 
   g_free (self->alternative_text);