Fix coccicheck warning which recommends to use memdup_user().

This patch fixes the following coccicheck warning:

drivers/scsi/aacraid/commctrl.c:516:15-22: WARNING opportunity for memdup_user

Link: https://lore.kernel.org/r/1587868964-75969-1-git-send-email-zou_wei@huawei.com
Fixes: 4645df10 ("[PATCH] aacraid: swapped kmalloc args.")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>