scsi: megaraid_sas: Use memdup_user() rather than duplicating its implementation

scsi: megaraid_sas: Use memdup_user() rather than duplicating its implementation

Orabug: 25568930

Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Acked by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 709ab231f8b4417411147dd9730928ba214d5c31)
Signed-off-by: Brian Maly <brian.maly@oracle.com>