nvmet_fc: cleanup of abort flag processing in fcp_op_done

Cleanup of abort flag processing in fcp_op_done.
References were unnecessary

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@fb.com>