[PATCH] hrtimers: fix possible use of NULL pointer in posix-timers

Fixup the conversion of posix-timers to hrtimers.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/posix-timers.c

@@ -290,6 +290,7 @@ void do_schedule_next_timer(struct siginfo *info)
 		info->si_overrun = timr->it_overrun_last;
 	}
 
+	if (timr)
 		unlock_timer(timr, flags);
 }