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

drivers/scsi/lpfc/lpfc_debugfs.c: In function 'lpfc_debugfs_nodelist_data':
drivers/scsi/lpfc/lpfc_debugfs.c:553:29: warning:
 variable 'tgtp' set but not used [-Wunused-but-set-variable]

It never used since 2b65e182 ("scsi: lpfc: NVME Target: Add debugfs support")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>