CIFS: Fix missing nls unload in smb2_reconnect()

[ Upstream commit 4772c79599564bd08ee6682715a7d3516f67433f ]

Cc: Stable <stable@vger.kernel.org>
Acked-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>