[mutter] stack-tracker: Fix unitialized variable

[Adel Gadllah <agadllah src gnome org>]

commit a378faf495351244189ba893e8e7c2733e7311a6
Author: Adel Gadllah <adel gadllah gmail com>
Date:   Sun Apr 20 15:55:50 2014 +0200

    stack-tracker: Fix unitialized variable

 src/core/stack-tracker.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/core/stack-tracker.c b/src/core/stack-tracker.c
index 77266a0..b76bf65 100644
--- a/src/core/stack-tracker.c
+++ b/src/core/stack-tracker.c
@@ -862,7 +862,7 @@ resync_verified_stack_with_xserver_stack (MetaStackTracker *tracker)
   GList *l;
   unsigned int i, j;
   MetaStackWindow *expected_xwindow;
-  gboolean modified_stack;
+  gboolean modified_stack = FALSE;
 
   /* Overview of the algorithm:
    *