regulator: lp3971: Do not hardcode return value

Propagate the error value returned by the function instead.

Signed-off-by: Sachin Kamat <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/lp3971.c

···
 		return -EIO;
 	ret = i2c_smbus_read_byte_data(i2c, reg);
 	if (ret < 0)
-		return -EIO;
+		return ret;
 
 	*dest = ret;
 	return 0;