dm: mmc: Rewrite mmc_blk_probe()

This function is called when the MMC block device is being probed. There
is a recursive call in this function since find_mmc_device() itself can
cause the MMC device to be probed.

Admittedly the MMC device should already be probed, since we would not be
probing its child otherwise, but the current code is unnecessarily
convoluted.

Rewrite this to access the MMC structure directly.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/mmc/mmc-uclass.c

@@ -260,13 +260,18 @@ static int mmc_select_hwpart(struct udevice *bdev, int hwpart)
 
 static int mmc_blk_probe(struct udevice *dev)
 {
-	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
-	int dev_num = block_dev->devnum;
-	struct mmc *mmc = find_mmc_device(dev_num);
+	struct udevice *mmc_dev = dev_get_parent(dev);
+	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(mmc_dev);
+	struct mmc *mmc = upriv->mmc;
+	int ret;
+
+	ret = mmc_init(mmc);
+	if (ret) {
+		debug("%s: mmc_init() failed (err=%d)\n", __func__, ret);
+		return ret;
+	}
 
-	if (!mmc)
-		return -ENODEV;
-	return mmc_init(mmc);
+	return 0;
 }
 
 static const struct blk_ops mmc_blk_ops = {