[gdk-pixbuf] Add a fall-through marker

[Matthias Clasen <matthiasc src gnome org>]

commit 30fe01d8c124c34a8423cd1517406c87e4f9489e
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Dec 28 00:17:26 2012 -0500

    Add a fall-through marker
    
    Coverity complained about this.

 gdk-pixbuf/io-gif.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gdk-pixbuf/io-gif.c b/gdk-pixbuf/io-gif.c
index 23d9d7a..a943f4e 100644
--- a/gdk-pixbuf/io-gif.c
+++ b/gdk-pixbuf/io-gif.c
@@ -1428,6 +1428,7 @@ gif_main_loop (GifContext *context)
 
 		case GIF_DONE:
                         LOG("done\n");
+                        /* fall through */
 		default:
 			retval = 0;
 			goto done;