rtmutex: Remove the extra call to try_to_take_lock

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From: Peter W. Morreale <pmorreale@novell.com>

Remove the redundant attempt to get the lock.  While it is true that the
exit path with this patch adds an un-necessary xchg (in the event the
lock is granted without further traversal in the loop) experimentation
shows that we almost never encounter this situation.
Signed-off-by: Peter W. Morreale <pmorreale@novell.com>
Signed-off-by: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/rtmutex.c

@@ -775,12 +775,6 @@ rt_spin_lock_slowlock(struct rt_mutex *lock)
 	atomic_spin_lock_irqsave(&lock->wait_lock, flags);
 	init_lists(lock);
 
-	/* Try to acquire the lock again: */
-	if (do_try_to_take_rt_mutex(lock, STEAL_LATERAL)) {
-		atomic_spin_unlock_irqrestore(&lock->wait_lock, flags);
-		return;
-	}
-
 	BUG_ON(rt_mutex_owner(lock) == current);
 
 	/*