iio: cm36651: Changed return value of read function

A return value of callback have been changed to IIO_VAL_INT.
If not IIO_VAL_INT, driver will print wrong value(*_read_int_time).

A follow up patch will deal with a related bug in the new event handling
code.
Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/light/cm36651.c

@@ -387,7 +387,7 @@ static int cm36651_read_int_time(struct cm36651_data *cm36651,
 		return -EINVAL;
 	}
 
-	return IIO_VAL_INT_PLUS_MICRO;
+	return IIO_VAL_INT;
 }
 
 static int cm36651_write_int_time(struct cm36651_data *cm36651,