locking/static_keys: Make verify_keys() static

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20150803184748.GA80634@lkp-ib04
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/lib/test_static_keys.c b/lib/test_static_keys.c
index 81d8105..c61b299 100644
--- a/lib/test_static_keys.c
+++ b/lib/test_static_keys.c
@@ -70,7 +70,7 @@
 	}
 }
 
-int verify_keys(struct test_key *keys, int size, bool invert)
+static int verify_keys(struct test_key *keys, int size, bool invert)
 {
 	int i;
 	bool ret, init;