[gimp] app: Return NULL if assertion fails

[Mukund Sivaraman <muks src gnome org>]

commit a2f6d60a422943cebe8afe9a4601452ee828309c
Author: Mukund Sivaraman <muks banu com>
Date:   Fri May 2 23:32:53 2014 +0530

    app: Return NULL if assertion fails

 app/tools/gimpmeasuretool.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/tools/gimpmeasuretool.c b/app/tools/gimpmeasuretool.c
index 11c304e..35a3eee 100644
--- a/app/tools/gimpmeasuretool.c
+++ b/app/tools/gimpmeasuretool.c
@@ -1046,7 +1046,7 @@ gimp_measure_tool_dialog_new (GimpMeasureTool *measure)
   GtkWidget        *table;
   GtkWidget        *label;
 
-  g_return_if_fail (tool->display != NULL);
+  g_return_val_if_fail (tool->display != NULL, NULL);
 
   shell = gimp_display_get_shell (tool->display);