regmap: debugfs: Add back in erroneously removed initialisation of ret

Fixes: 94cc89eb ("regmap: debugfs: Fix handling of name string for debugfs init delays")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20200918112002.15216-1-ckeepax@opensource.cirrus.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/base/regmap/regmap.c

@@ -694,9 +694,9 @@ struct regmap *__regmap_init(struct device *dev,
 			     const char *lock_name)
 {
 	struct regmap *map;
+	int ret = -EINVAL;
 	enum regmap_endian reg_endian, val_endian;
 	int i, j;
-	int ret;
 
 	if (!config)
 		goto err;