Backport from mysql-trunk-bugfixing of:

------------------------------------------------------------
revno: 3309
committer: Tor Didriksen <tor.didriksen@oracle.com>
branch nick: trunk-bugfixing
timestamp: Mon 2010-11-01 08:58:27 +0100
message:
  Bug#45288: pb2 returns a lot of compilation warnings
  
  DBG build broken on binary-werror-linux-x86_64-tar-gz
  storage/innobase/os/os0sync.c:659: warning: 'timed_out' may be used uninitialized in this function

storage/innobase/os/os0sync.c

@@ -656,7 +656,7 @@ os_event_wait_time_low(
 						os_event_reset(). */
 
 {
-	ibool		timed_out;
+	ibool		timed_out = FALSE;
 	ib_int64_t	old_signal_count;
 
 #ifdef __WIN__