regmap: Fix unused warning

This patch fixes the warning of label 'err_map' defined but not used.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/base/regmap/regmap.c

@@ -699,7 +699,7 @@ struct regmap *__regmap_init(struct device *dev,
 		map->lock_arg = map;
 #else
 		ret = -EINVAL;
-		goto err;
+		goto err_map;
 #endif
 	} else {
 		if ((bus && bus->fast_io) ||