[PATCH] Keys: Get rid of warning in kmod.c if keys disabled

The attached patch gets rid of a "statement without effect" warning when
CONFIG_KEYS is disabled by making use of the return value of key_get().
The compiler will optimise all of this away when keys are disabled.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/kmod.c

@@ -131,14 +131,14 @@ struct subprocess_info {
 static int ____call_usermodehelper(void *data)
 {
 	struct subprocess_info *sub_info = data;
-	struct key *old_session;
+	struct key *new_session, *old_session;
 	int retval;
 
 	/* Unblock all signals and set the session keyring. */
-	key_get(sub_info->ring);
+	new_session = key_get(sub_info->ring);
 	flush_signals(current);
 	spin_lock_irq(&current->sighand->siglock);
-	old_session = __install_session_keyring(current, sub_info->ring);
+	old_session = __install_session_keyring(current, new_session);
 	flush_signal_handlers(current, 1);
 	sigemptyset(&current->blocked);
 	recalc_sigpending();