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/mxsmmc.c b/drivers/mmc/mxsmmc.c
index 0896028..fe1fe70 100644
--- a/drivers/mmc/mxsmmc.c
+++ b/drivers/mmc/mxsmmc.c
@@ -304,7 +304,7 @@
 	return 0;
 }
 
-static void mxsmmc_set_ios(struct mmc *mmc)
+static int mxsmmc_set_ios(struct mmc *mmc)
 {
 	struct mxsmmc_priv *priv = mmc->priv;
 	struct mxs_ssp_regs *ssp_regs = priv->regs;
@@ -331,6 +331,8 @@
 
 	debug("MMC%d: Set %d bits bus width\n",
 		mmc->block_dev.devnum, mmc->bus_width);
+
+	return 0;
 }
 
 static int mxsmmc_init(struct mmc *mmc)