mmc: change the set_ios return type from void to int

To maintain consistency, set_ios type of legacy mmc_ops changed to int.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/drivers/mmc/davinci_mmc.c b/drivers/mmc/davinci_mmc.c
index b495c75..9edb668 100644
--- a/drivers/mmc/davinci_mmc.c
+++ b/drivers/mmc/davinci_mmc.c
@@ -348,7 +348,7 @@
 }
 
 /* Set buswidth or clock as indicated by the GENERIC_MMC framework */
-static void dmmc_set_ios(struct mmc *mmc)
+static int dmmc_set_ios(struct mmc *mmc)
 {
 	struct davinci_mmc *host = mmc->priv;
 	struct davinci_mmc_regs *regs = host->reg_base;
@@ -362,6 +362,8 @@
 	/* Set clock speed */
 	if (mmc->clock)
 		dmmc_set_clock(mmc, mmc->clock);
+
+	return 0;
 }
 
 static const struct mmc_ops dmmc_ops = {