mmc: sdhci-sprd: Fix error code in sdhci_sprd_tuning()

Return an error code if sdhci_sprd_get_best_clk_sample() fails.
Currently, it returns success.

Fixes: d83d251 ("mmc: sdhci-sprd: Add SD HS mode online tuning")
Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: Wenchao Chen <[email protected]>
Reviewed-by: Baolin Wang <[email protected]>
Acked-by: Adrian Hunter <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: Dan Carpenter

drivers/mmc/host/sdhci-sprd.c

@@ -644,6 +644,7 @@ static int sdhci_sprd_tuning(struct mmc_host *mmc, struct mmc_card *card,
 	best_clk_sample = sdhci_sprd_get_best_clk_sample(mmc, value);
 	if (best_clk_sample < 0) {
 		dev_err(mmc_dev(host->mmc), "all tuning phase fail!\n");
+		err = best_clk_sample;
 		goto out;
 	}