regmap: make sure we unlock on failure in regmap_bulk_write

Signed-off-by: Courtney Cavin <courtney.cavin@sonymobile.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/base/regmap/regmap.c

@@ -1549,7 +1549,7 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
 						val + (i * val_bytes),
 						val_bytes);
 			if (ret != 0)
-				return ret;
+				goto out;
 		}
 	} else {
 		ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);