scsi: fnic: Remove set but not used variable in is_fnic_fip_flogi_reject()

scsi: fnic: Remove set but not used variable in is_fnic_fip_flogi_reject()

This addresses the following gcc warning with "make W=1":

drivers/scsi/fnic/fnic_fcs.c: In function ‘is_fnic_fip_flogi_reject’:
drivers/scsi/fnic/fnic_fcs.c:317:9: warning: variable ‘els_len’ set but
not used [-Wunused-but-set-variable]
  317 |  size_t els_len = 0;
      |         ^~~~~~~
drivers/scsi/fnic/fnic_fcs.c:312:21: warning: variable ‘els_dtype’ set
but not used [-Wunused-but-set-variable]
  312 |  enum fip_desc_type els_dtype = 0;
      |                     ^~~~~~~~~

Link: https://lore.kernel.org/r/20200831081126.3251288-3-yanaijie@huawei.com
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>