fsnotify: cleanup should_send_event

The change to use srcu and walk the object list rather than the global
fsnotify_group list means that should_send_event is no longer needed for a
number of groups and can be simplified for others.  Do that.

Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 584b943..2abb99f 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -923,7 +923,7 @@
 				  struct vfsmount *mnt, struct fsnotify_mark *mark,
 				  __u32 mask, void *data, int data_type)
 {
-	return 0;
+	return false;
 }
 
 static const struct fsnotify_ops audit_tree_ops = {