Fixes gcc '-Wunused-but-set-variable' warning:

drivers/scsi/fcoe/fcoe.c: In function 'fcoe_recv_frame':
drivers/scsi/fcoe/fcoe.c:1672:20: warning:
 variable 'port' set but not used [-Wunused-but-set-variable]

drivers/scsi/fcoe/fcoe.c: In function 'fcoe_device_notification':
drivers/scsi/fcoe/fcoe.c:1861:20: warning:
 variable 'port' set but not used [-Wunused-but-set-variable]
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Johannes Thumshirn <jth@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>