mtd: introduce mtd_suspend interface

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 4a21557..0db455d 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -119,7 +119,7 @@
 	struct mtd_info *mtd = dev_to_mtd(dev);
 
 	if (mtd && mtd->suspend)
-		return mtd->suspend(mtd);
+		return mtd_suspend(mtd);
 	else
 		return 0;
 }