scsi: bnx2fc: Remove set but not used variable 'oxid'

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

drivers/scsi/bnx2fc/bnx2fc_fcoe.c: In function 'bnx2fc_rcv':
drivers/scsi/bnx2fc/bnx2fc_fcoe.c:435:17: warning:
 variable 'oxid' set but not used [-Wunused-but-set-variable]

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>