cifs: use LIST_HEAD() and list_move() to simplify code

list_head can be initialized automatically with LIST_HEAD()
instead of calling INIT_LIST_HEAD().

Using list_move() instead of list_del() and list_add().

Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/cached_dir.c

@@ -378,13 +378,11 @@ void invalidate_all_cached_dirs(struct cifs_tcon *tcon)
 {
 	struct cached_fids *cfids = tcon->cfids;
 	struct cached_fid *cfid, *q;
-	struct list_head entry;
+	LIST_HEAD(entry);
 
-	INIT_LIST_HEAD(&entry);
 	spin_lock(&cfids->cfid_list_lock);
 	list_for_each_entry_safe(cfid, q, &cfids->entries, entry) {
-		list_del(&cfid->entry);
-		list_add(&cfid->entry, &entry);
+		list_move(&cfid->entry, &entry);
 		cfids->num_entries--;
 		cfid->is_open = false;
 		/* To prevent race with smb2_cached_lease_break() */
@@ -518,15 +516,13 @@ struct cached_fids *init_cached_dirs(void)
 void free_cached_dirs(struct cached_fids *cfids)
 {
 	struct cached_fid *cfid, *q;
-	struct list_head entry;
+	LIST_HEAD(entry);
 
-	INIT_LIST_HEAD(&entry);
 	spin_lock(&cfids->cfid_list_lock);
 	list_for_each_entry_safe(cfid, q, &cfids->entries, entry) {
 		cfid->on_list = false;
 		cfid->is_open = false;
-		list_del(&cfid->entry);
-		list_add(&cfid->entry, &entry);
+		list_move(&cfid->entry, &entry);
 	}
 	spin_unlock(&cfids->cfid_list_lock);