scsi: lpfc: Fix validation of bsg reply lengths

There are a couple of code areas which validate sufficient reply buffer
length, but the checks are using the request elements rather than the reply
elements.

Rework to validate using the reply structures.

Link: https://lore.kernel.org/r/20200803210229.23063-7-jsmart2021@gmail.com


Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>