[SCSI] scsi_dh: no need to initialize rq->cmd with blk_get_request

blk_get_request initializes rq->cmd (rq_init does) so the users don't
need to do that.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: NChandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/device_handler/scsi_dh_emc.c

@@ -278,7 +278,6 @@ static struct request *get_req(struct scsi_device *sdev, int cmd,
 		return NULL;
 	}
 
-	memset(rq->cmd, 0, BLK_MAX_CDB);
 	rq->cmd_len = COMMAND_SIZE(cmd);
 	rq->cmd[0] = cmd;
 

drivers/scsi/device_handler/scsi_dh_hp_sw.c

@@ -114,7 +114,6 @@ static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
 	req->cmd_type = REQ_TYPE_BLOCK_PC;
 	req->cmd_flags |= REQ_FAILFAST;
 	req->cmd_len = COMMAND_SIZE(TEST_UNIT_READY);
-	memset(req->cmd, 0, MAX_COMMAND_SIZE);
 	req->cmd[0] = TEST_UNIT_READY;
 	req->timeout = HP_SW_TIMEOUT;
 	req->sense = h->sense;
@@ -207,7 +206,6 @@ static int hp_sw_start_stop(struct scsi_device *sdev, struct hp_sw_dh_data *h)
 	req->cmd_type = REQ_TYPE_BLOCK_PC;
 	req->cmd_flags |= REQ_FAILFAST;
 	req->cmd_len = COMMAND_SIZE(START_STOP);
-	memset(req->cmd, 0, MAX_COMMAND_SIZE);
 	req->cmd[0] = START_STOP;
 	req->cmd[4] = 1;	/* Start spin cycle */
 	req->timeout = HP_SW_TIMEOUT;

drivers/scsi/device_handler/scsi_dh_rdac.c

@@ -225,8 +225,6 @@ static struct request *get_rdac_req(struct scsi_device *sdev,
 		return NULL;
 	}
 
-	memset(rq->cmd, 0, BLK_MAX_CDB);
-
 	rq->cmd_type = REQ_TYPE_BLOCK_PC;
 	rq->cmd_flags |= REQ_FAILFAST | REQ_NOMERGE;
 	rq->retries = RDAC_RETRIES;