scsi: bfa: remove unused pointer 'port'

The pointer 'port' is being assigned but it is never read, hence it is
redundant and can be removed. Cleans up clang warning:

drivers/scsi/bfa/bfad_attr.c:505:2: warning: Value stored to 'port' is
never read.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>