rcutorture: Mark rcu_torture_init as __init

The corresponding rcu_torture_cleanup cannot get marked as __exit, because
rcu_torture_init uses it to clean up if init fails.
Signed-off-by: Josh Triplett <josh@freedesktop.org>
Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/rcutorture.c

@@ -866,7 +866,7 @@ rcu_torture_cleanup(void)
 		rcu_torture_print_module_parms("End of test: SUCCESS");
 }
 
-static int
+static int __init
 rcu_torture_init(void)
 {
 	int i;