scsi: megaraid_sas: Remove unnecessary memset

instance->cmd_list is allocated by kcalloc(). The memory is already set to
zero. It is unnecessary to call memset again.

Link: https://lore.kernel.org/r/20220407072442.4137977-1-wanjiabing@vivo.com


Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Wan Jiabing <wanjiabing@vivo.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>