mmc: sdhci: return error when failed add_sdhci().

If failed the add_host(), it is reasonable that return value of
add_sdhci().

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/drivers/mmc/mv_sdhci.c b/drivers/mmc/mv_sdhci.c
index 2fe34b6..63e1f90 100644
--- a/drivers/mmc/mv_sdhci.c
+++ b/drivers/mmc/mv_sdhci.c
@@ -51,6 +51,5 @@
 		host->version = sdhci_readl(host, SDHCI_HOST_VERSION - 2) >> 16;
 	else
 		host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
-	add_sdhci(host, max_clk, min_clk);
-	return 0;
+	return add_sdhci(host, max_clk, min_clk);
 }