scsi: scsi_debug: Remove a useless memset()

'arr' is kzalloc()'ed, so there is no need to call memset(.., 0, ...) on
it. It is already cleared.

This is a follow up of commit b952eb27 ("scsi: scsi_debug: Allocate the
MODE SENSE response from the heap").

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/6296722174e39a51cac74b7fc68b0d75bd0db2a3.1725690433.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>