clutter-backend: Fix the error check in _clutter_backend_create_stage

Commit d2bdd3cb62 fixed some compiler warnings but also broke the
ability to create a stage. Although not having warnings from the
compiler is nice, it is also nice to be able to create a stage so lets
not invert the meaning of the error check.

diff --git a/clutter/clutter-backend.c b/clutter/clutter-backend.c
index 1ba5889..ed257d1 100644 (file)
--- a/clutter/clutter-backend.c
+++ b/clutter/clutter-backend.c
@@ -290,7 +290,7 @@ _clutter_backend_create_stage (ClutterBackend  *backend,
   else
     stage_window = NULL;
 
-  if (stage_window != NULL)
+  if (stage_window == NULL)
     return NULL;
 
   g_assert (CLUTTER_IS_STAGE_WINDOW (stage_window));