iio: tcs3472: move standalone return to default case

Move the trailing 'return -EINVAL' statements at the end of
tcs3472_read_raw() and tcs3472_write_raw() into explicit default:
cases inside the respective switch statements.

This removes the need for a separate return statement
after the switch.

No functional change.

Suggested-by: Andy Shevchenko <andy@kernel.org>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Reviewed-by: Joshua Crofts <joshua.crofts1@gmail.com>
Signed-off-by: Aldo Conte <aldocontelk@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Author: aldocontelk

drivers/iio/light/tcs3472.c

@@ -166,8 +166,9 @@ static int tcs3472_read_raw(struct iio_dev *indio_dev,
 		*val = 0;
 		*val2 = (256 - data->atime) * 2400;
 		return IIO_VAL_INT_PLUS_MICRO;
+	default:
+		return -EINVAL;
 	}
-	return -EINVAL;
 }
 
 static int tcs3472_write_raw(struct iio_dev *indio_dev,
@@ -204,8 +205,9 @@ static int tcs3472_write_raw(struct iio_dev *indio_dev,
 
 		}
 		return -EINVAL;
+	default:
+		return -EINVAL;
 	}
-	return -EINVAL;
 }
 
 /*