regmap: regmap-w1: Drop unreachable code

Both init functions have a stray "return NULL" at the end which is never
reached so drop them.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://lore.kernel.org/r/20191119125837.47619-1-mika.westerberg@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/base/regmap/regmap-w1.c

@@ -215,8 +215,6 @@ struct regmap *__regmap_init_w1(struct device *w1_dev,
 
 	return __regmap_init(w1_dev, bus, w1_dev, config,
 			 lock_key, lock_name);
-
-	return NULL;
 }
 EXPORT_SYMBOL_GPL(__regmap_init_w1);
 
@@ -233,8 +231,6 @@ struct regmap *__devm_regmap_init_w1(struct device *w1_dev,
 
 	return __devm_regmap_init(w1_dev, bus, w1_dev, config,
 				 lock_key, lock_name);
-
-	return NULL;
 }
 EXPORT_SYMBOL_GPL(__devm_regmap_init_w1);