gfs2: Use list_move_tail instead of list_del/list_add_tail

Using list_move_tail() instead of list_del() + list_add_tail().
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/glock.c

@@ -212,8 +212,7 @@ void gfs2_glock_add_to_lru(struct gfs2_glock *gl)
 
 	spin_lock(&lru_lock);
 
-	list_del(&gl->gl_lru);
-	list_add_tail(&gl->gl_lru, &lru_list);
+	list_move_tail(&gl->gl_lru, &lru_list);
 
 	if (!test_bit(GLF_LRU, &gl->gl_flags)) {
 		set_bit(GLF_LRU, &gl->gl_flags);