futex: Make should_fail_futex() static

Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Cc: kbuild-all@01.org
Cc: tipbuild@zytor.com
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Darren Hart <darren@dvhart.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Brian Silverman <bsilver16384@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

kernel/futex.c

@@ -279,7 +279,7 @@ static int __init setup_fail_futex(char *str)
 }
 __setup("fail_futex=", setup_fail_futex);
 
-bool should_fail_futex(bool fshared)
+static bool should_fail_futex(bool fshared)
 {
 	if (fail_futex.ignore_private && !fshared)
 		return false;