Use kzalloc in idedisk_prep_fn.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/ide/ide-disk.c

@@ -435,12 +435,11 @@ static int idedisk_prep_fn(struct request_queue *q, struct request *rq)
 	if (!(rq->cmd_flags & REQ_FLUSH))
 		return BLKPREP_OK;
 
-	cmd = kmalloc(sizeof(*cmd), GFP_ATOMIC);
+	cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
 
 	/* FIXME: map struct ide_taskfile on rq->cmd[] */
 	BUG_ON(cmd == NULL);
 
-	memset(cmd, 0, sizeof(*cmd));
 	if (ata_id_flush_ext_enabled(drive->id) &&
 	    (drive->capacity64 >= (1UL << 28)))
 		cmd->tf.command = ATA_CMD_FLUSH_EXT;