[snappy] fix build warning

[Luis de Bethencourt <luisbg src gnome org>]

commit 39a8f44d9eeceb909965f14a49b023727415c879
Author: Luis de Bethencourt <luis debethencourt com>
Date:   Thu Apr 18 17:57:40 2013 -0400

    fix build warning

 src/user_interface.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/user_interface.c b/src/user_interface.c
index 7801fd2..9a366f4 100644
--- a/src/user_interface.c
+++ b/src/user_interface.c
@@ -164,7 +164,7 @@ draw_progressbar (ClutterCanvas * canvas, cairo_t * cr, int surface_width,
 
   pattern = cairo_pattern_create_linear (0.0, 0.0, surface_width, 0.0);
 
-  if (canvas == ui->seek_canvas) {
+  if (canvas == CLUTTER_CANVAS (ui->seek_canvas)) {
     // if called for seek canvas, update playback position
     position = ui->playback_position;
   } else {