[dia] [warningectomy] no return statement in function returning non-void

[Hans Breuer <hans src gnome org>]

commit 010b717e861cbba471e2c555e8c3b4d0f9fea6cd
Author: Hans Breuer <hans breuer org>
Date:   Fri Sep 5 16:05:54 2014 +0200

    [warningectomy] no return statement in function returning non-void
    
    export_png.c: In function 'export_png':
    export_png.c:379:1: warning: no return statement in function returning non-void

 plug-ins/libart/export_png.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/plug-ins/libart/export_png.c b/plug-ins/libart/export_png.c
index a9daec9..5d55392 100644
--- a/plug-ins/libart/export_png.c
+++ b/plug-ins/libart/export_png.c
@@ -376,6 +376,7 @@ export_png(DiagramData *data, DiaContext *ctx,
     cbdata->size = (gchar *) user_data;
     export_png_ok(NULL, cbdata);
   }
+  return TRUE;
 }
 
 static const gchar *extensions[] = { "png", NULL };