mmc: sdhci-of-dwcmshc: fix error return code in dwcmshc_probe()

Fix to return negative error code -ENOMEM from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: c2c4da37837e ("mmc: sdhci-of-dwcmshc: add rockchip platform support")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Link: https://lore.kernel.org/r/20210323112956.1016884-1-weiyongjun1@huawei.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-of-dwcmshc.c

@@ -404,8 +404,10 @@ static int dwcmshc_probe(struct platform_device *pdev)
 
 	if (pltfm_data == &sdhci_dwcmshc_rk3568_pdata) {
 		rk_priv = devm_kzalloc(&pdev->dev, sizeof(struct rk3568_priv), GFP_KERNEL);
-		if (!rk_priv)
+		if (!rk_priv) {
+			err = -ENOMEM;
 			goto err_clk;
+		}
 
 		priv->priv = rk_priv;