The recent fixups in futex.c need to be applied to futex_compat.c too.  Fixes
a hang reported by Olaf.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Olaf Hering <olh@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>