regmap: mmio: remove the useless code

Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c
index 8a77876..dc991c3 100644
--- a/drivers/base/regmap/regmap-mmio.c
+++ b/drivers/base/regmap/regmap-mmio.c
@@ -247,7 +247,6 @@
 		min_stride = 8;
 		break;
 #endif
-		break;
 	default:
 		return ERR_PTR(-EINVAL);
 	}