ksmbd: Unlock on in ksmbd_tcp_set_interfaces()

Unlock before returning an error code if this allocation fails.

Fixes: 0626e664 ("cifsd: add server handler for central processing and tranport layers")
Cc: stable@vger.kernel.org # v5.15+
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/server/transport_tcp.c

@@ -624,8 +624,10 @@ int ksmbd_tcp_set_interfaces(char *ifc_list, int ifc_list_sz)
 		for_each_netdev(&init_net, netdev) {
 			if (netif_is_bridge_port(netdev))
 				continue;
-			if (!alloc_iface(kstrdup(netdev->name, GFP_KERNEL)))
+			if (!alloc_iface(kstrdup(netdev->name, GFP_KERNEL))) {
+				rtnl_unlock();
 				return -ENOMEM;
+			}
 		}
 		rtnl_unlock();
 		bind_additional_ifaces = 1;