ksmbd: remove unneeded NULL check in the list iterator

Remove unneeded NULL check in the list iterator. And use
list_for_each_entry_safe instead of list_for_each_safe.
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifsd/mgmt/user_session.c

@@ -30,16 +30,13 @@ struct ksmbd_session_rpc {
 
 static void free_channel_list(struct ksmbd_session *sess)
 {
-	struct channel *chann;
-	struct list_head *tmp, *t;
+	struct channel *chann, *tmp;
 
-	list_for_each_safe(tmp, t, &sess->ksmbd_chann_list) {
-		chann = list_entry(tmp, struct channel, chann_list);
-		if (chann) {
+	list_for_each_entry_safe(chann, tmp, &sess->ksmbd_chann_list,
+				 chann_list) {
 		list_del(&chann->chann_list);
 		kfree(chann);
 	}
-	}
 }
 
 static void __session_rpc_close(struct ksmbd_session *sess,

fs/cifsd/smb2pdu.c

@@ -76,7 +76,7 @@ struct channel *lookup_chann_list(struct ksmbd_session *sess, struct ksmbd_conn
 	struct channel *chann;
 
 	list_for_each_entry(chann, &sess->ksmbd_chann_list, chann_list) {
-		if (chann && chann->conn == conn)
+		if (chann->conn == conn)
 			return chann;
 	}