regmap: Fix memory leak in regmap_init error path

If regcache initialization fails regmap_init will currently exit without
freeing work_buf.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/base/regmap/regmap.c

@@ -229,12 +229,14 @@ struct regmap *regmap_init(struct device *dev,
 
 	ret = regcache_init(map);
 	if (ret < 0)
-		goto err_map;
+		goto err_free_workbuf;
 
 	regmap_debugfs_init(map);
 
 	return map;
 
+err_free_workbuf:
+	kfree(map->work_buf);
 err_map:
 	kfree(map);
 err: