cred: Replace deprecated spinlock initialization

SPIN_LOCK_UNLOCK is deprecated. Use the lockdep capable variant
instead.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

kernel/cred.c

@@ -35,7 +35,7 @@ static struct kmem_cache *cred_jar;
 static struct thread_group_cred init_tgcred = {
 	.usage	= ATOMIC_INIT(2),
 	.tgid	= 0,
-	.lock	= SPIN_LOCK_UNLOCKED,
+	.lock	= __SPIN_LOCK_UNLOCKED(init_cred.tgcred.lock),
 };
 #endif