[gimp] app: cast g_object_ref() argument in gimp_plug_in_proc_frame_init()

[Michael Natterer <mitch src gnome org>]

commit d528f80c16735f35f9d61f099323c1f246b27ecc
Author: Michael Natterer <mitch gimp org>
Date:   Sat Apr 14 21:14:52 2018 +0200

    app: cast g_object_ref() argument in gimp_plug_in_proc_frame_init()

 app/plug-in/gimppluginprocframe.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/plug-in/gimppluginprocframe.c b/app/plug-in/gimppluginprocframe.c
index 56a91fc..60f6886 100644
--- a/app/plug-in/gimppluginprocframe.c
+++ b/app/plug-in/gimppluginprocframe.c
@@ -77,7 +77,7 @@ gimp_plug_in_proc_frame_init (GimpPlugInProcFrame *proc_frame,
 
   proc_frame->main_context       = g_object_ref (context);
   proc_frame->context_stack      = NULL;
-  proc_frame->procedure          = procedure ? g_object_ref (procedure) : NULL;
+  proc_frame->procedure          = procedure ? g_object_ref (GIMP_PROCEDURE (procedure)) : NULL;
   proc_frame->main_loop          = NULL;
   proc_frame->return_vals        = NULL;
   proc_frame->progress           = progress ? g_object_ref (progress) : NULL;