scsi: lpfc: Remove set but not used variable 'psli'

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

drivers/scsi/lpfc/lpfc_hbadisc.c: In function 'lpfc_free_tx':
drivers/scsi/lpfc/lpfc_hbadisc.c:5431:19: warning:
 variable 'psli' set but not used [-Wunused-but-set-variable]

Since commit 895427bd

 ("scsi: lpfc: NVME Initiator: Base modifications")
'psli' is not used any more.

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