exynos: Fix passing of errors in exynos_mmc_init()

exynos_mmc_init() always returns zero, so for the caller
it looks like it never fails.

Correct this by returning the error code of process_nodes().
For process_nodes() do something similar and return early
when do_sdhci_init() fails.

v2: Only fail in process_nodes() if we fail on all
    available nodes.

Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>
Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

drivers/mmc/s5p_sdhci.c

@@ -171,6 +171,7 @@ static int process_nodes(const void *blob, int node_list[], int count)
 {
 	struct sdhci_host *host;
 	int i, node;
+	int failed = 0;
 
 	debug("%s: count = %d\n", __func__, count);
 
@@ -184,11 +185,18 @@ static int process_nodes(const void *blob, int node_list[], int count)
 
 		if (sdhci_get_config(blob, node, host)) {
 			printf("%s: failed to decode dev %d\n",	__func__, i);
-			return -1;
+			failed++;
+			continue;
+		}
+
+		if (do_sdhci_init(host)) {
+			printf("%s: failed to initialize dev %d\n", __func__, i);
+			failed++;
 		}
-		do_sdhci_init(host);
 	}
-	return 0;
+
+	/* we only consider it an error when all nodes fail */
+	return (failed == count ? -1 : 0);
 }
 
 int exynos_mmc_init(const void *blob)
@@ -200,8 +208,6 @@ int exynos_mmc_init(const void *blob)
 			COMPAT_SAMSUNG_EXYNOS_MMC, node_list,
 			SDHCI_MAX_HOSTS);
 
-	process_nodes(blob, node_list, count);
-
-	return 0;
+	return process_nodes(blob, node_list, count);
 }
 #endif