mmc: block: change to use kmalloc when copy data from userspace

Use kmalloc instead of kzalloc, as zeroing the memory isn't needed.
Signed-off-by: yalin wang <yalin.wang2010@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/card/block.c

@@ -344,7 +344,7 @@ static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 	struct mmc_blk_ioc_data *idata;
 	int err;
 
-	idata = kzalloc(sizeof(*idata), GFP_KERNEL);
+	idata = kmalloc(sizeof(*idata), GFP_KERNEL);
 	if (!idata) {
 		err = -ENOMEM;
 		goto out;
@@ -364,7 +364,7 @@ static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 	if (!idata->buf_bytes)
 		return idata;
 
-	idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
+	idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
 	if (!idata->buf) {
 		err = -ENOMEM;
 		goto idata_err;