mtd: error return -EIO instead of EIO

Return a negative error value instead of a positive

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/maps/physmap.c b/drivers/mtd/maps/physmap.c
index 3f13a96..d9603f7 100644
--- a/drivers/mtd/maps/physmap.c
+++ b/drivers/mtd/maps/physmap.c
@@ -129,7 +129,7 @@
 						 info->map[i].size);
 		if (info->map[i].virt == NULL) {
 			dev_err(&dev->dev, "Failed to ioremap flash region\n");
-			err = EIO;
+			err = -EIO;
 			goto err_out;
 		}