fanotify: do not return 0 in a void function

remove_access_response() is supposed to have a void return, but was
returning 0;

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 87f0be8..7c869fa 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -231,7 +231,7 @@
 				   struct fsnotify_event *event,
 				   __s32 fd)
 {
-	return 0;
+	return;
 }
 #endif