staging: iio: adc: ad7280a.c: fixed macro coding style

remove unnecessary semicolon from the macro definition

Signed-off-by: Kumar Amit Mehta <gmate.amit@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/adc/ad7280a.c

@@ -117,7 +117,7 @@
  */
 #define POLYNOM		0x2F
 #define POLYNOM_ORDER	8
-#define HIGHBIT		1 << (POLYNOM_ORDER - 1);
+#define HIGHBIT		(1 << (POLYNOM_ORDER - 1))
 
 struct ad7280_state {
 	struct spi_device		*spi;