mmc: renesas_sdhi: fix error code in renesas_sdhi_probe()

If devm_regulator_register() fails then propagate the error code.  Don't
return success.

Fixes: fae80a9 ("mmc: renesas_sdhi: Add support for RZ/G3E SoC")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/dc39e555-8ef7-4a39-9253-65bcf3e50c01@stanley.mountain
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: Dan Carpenter

drivers/mmc/host/renesas_sdhi_core.c

@@ -1178,6 +1178,7 @@ int renesas_sdhi_probe(struct platform_device *pdev,
 		of_node_put(rcfg.of_node);
 		if (IS_ERR(rdev)) {
 			dev_err(dev, "regulator register failed err=%ld", PTR_ERR(rdev));
+			ret = PTR_ERR(rdev);
 			goto efree;
 		}
 		priv->rdev = rdev;