[SCSI] lpfc : scsi command accessor fix for 8.2.2

It was pointed out by Boaz Harrosh <bharrosh@panasas.com> that our
8.2.2 lpfc patches revert a change to using SCSI command accessor
functions.

This patch, to be applied on top of the 8.2.2. patches, updates the
driver for the accessor functions.
Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/lpfc/lpfc_scsi.c

@@ -499,7 +499,7 @@ lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
 					 "0717 FCP command x%x residual "
 					 "underrun converted to error "
 					 "Data: x%x x%x x%x\n",
-					 cmnd->cmnd[0], cmnd->request_bufflen,
+					 cmnd->cmnd[0], scsi_bufflen(cmnd),
 					 scsi_get_resid(cmnd), cmnd->underflow);
 			host_status = DID_ERROR;
 		}