scsi: megaraid_sas: array overflow in megasas_dump_frame()

The "sz" variable is in terms of bytes, but we're treating the buffer as
an array of __le32 so we have to divide by 4.

Fixes: def0eab3 ("scsi: megaraid_sas: enhance debug logs in OCR context")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>