themingengine: Return NULL for nonexistant theming engines

his also makes the function conform to its documentation.

diff --git a/gtk/gtkthemingengine.c b/gtk/gtkthemingengine.c
index 1e5d735d649eccfc2476d66954bdc36c3b935d81..d07640931575d0652c395dce8deabc5f26a60df3 100644 (file)
--- a/gtk/gtkthemingengine.c
+++ b/gtk/gtkthemingengine.c
@@ -1020,8 +1020,7 @@ gtk_theming_engine_load (const gchar *name)
             }
         }
     }
-
-  if (!engine)
+  else
     {
       if (G_UNLIKELY (!default_engine))
         default_engine = g_object_new (GTK_TYPE_THEMING_ENGINE, NULL);