[SCSI] lpfc 8.3.30: Fixed panic with extents and small blocks

Fixed system panic when extents enabled with large number of small blocks

Signed-off-by: Alex Iannicelli <alex.iannicelli@emulex.com>
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>