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 b952eb2 ("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>

Author: tititiou36

drivers/scsi/scsi_debug.c

@@ -2760,7 +2760,6 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
 	else
 		bd_len = 0;
 	alloc_len = msense_6 ? cmd[4] : get_unaligned_be16(cmd + 7);
-	memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
 	if (0x3 == pcontrol) {  /* Saving values not supported */
 		mk_sense_buffer(scp, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP, 0);
 		return check_condition_result;