[gimp] app: fix error handling warning in gimp_brush_load_abr()

[Michael Natterer <mitch src gnome org>]

commit 6e631420c33045215dc1962f9d91151b074f2dfb
Author: Michael Natterer <mitch gimp org>
Date:   Fri Jul 4 19:16:58 2014 +0200

    app: fix error handling warning in gimp_brush_load_abr()

 app/core/gimpbrush-load.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/app/core/gimpbrush-load.c b/app/core/gimpbrush-load.c
index d01cfe6..624f71c 100644
--- a/app/core/gimpbrush-load.c
+++ b/app/core/gimpbrush-load.c
@@ -446,7 +446,8 @@ gimp_brush_load_abr (GimpContext   *context,
                      abr_hdr.version);
     }
 
-  g_propagate_error (error, my_error);
+  if (my_error)
+    g_propagate_error (error, my_error);
 
   return g_list_reverse (brush_list);
 }