nvmet-fc: on port remove call put outside lock

Avoid calling the put routine, as it may traverse to free routines while
holding the target lock.

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>