kill path_lookup()

all remaining callers pass LOOKUP_PARENT to it, so
flags argument can die; renamed to kern_path_parent()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

kernel/audit_watch.c

@@ -359,7 +359,7 @@ static int audit_get_nd(struct audit_watch *watch, struct path *parent)
 	struct dentry *d;
 	int err;
 
-	err = path_lookup(watch->path, LOOKUP_PARENT, &nd);
+	err = kern_path_parent(watch->path, &nd);
 	if (err)
 		return err;