iio: Fix tcs3472 buffer size

and drop obsolete #define

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/light/tcs3472.c

@@ -55,12 +55,9 @@ struct tcs3472_data {
 	u8 enable;
 	u8 control;
 	u8 atime;
-	u16 buffer[4];
+	u16 buffer[8]; /* 4 16-bit channels + 64-bit timestamp */
 };
 
-/* 4 16-bit channels + timestamp = 16 bytes */
-#define TSL3472_BUFFER_SIZE 16
-
 #define TCS3472_CHANNEL(_color, _si, _addr) { \
 	.type = IIO_INTENSITY, \
 	.modified = 1, \