[SCSI] tgt: stop zero'ing scsi_cmnd

The scsi midlayer allocates scsi_cmnd->sense_buffer dynamically so we
can't initialize scsi_cmnd (the midlyaer does for us).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/scsi_tgt_lib.c

@@ -103,7 +103,6 @@ struct scsi_cmnd *scsi_host_get_command(struct Scsi_Host *shost,
 	if (!cmd)
 		goto release_rq;
 
-	memset(cmd, 0, sizeof(*cmd));
 	cmd->sc_data_direction = data_dir;
 	cmd->jiffies_at_alloc = jiffies;
 	cmd->request = rq;