kernel/rtmutex-debug.c: cleanups

This patch contains the following cleanups:
- make the needlessly global variable rt_trace_on static
- remove the unused global function deadlock_trace_off()
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

kernel/rtmutex-debug.c

@@ -82,12 +82,7 @@ do {						\
  * into the tracing code when doing error printk or
  * executing a BUG():
  */
-int rt_trace_on = 1;
-
-void deadlock_trace_off(void)
-{
-	rt_trace_on = 0;
-}
+static int rt_trace_on = 1;
 
 static void printk_task(struct task_struct *p)
 {