iio: adc: ti-ads1298: Add parentheses around macro parameter

ADS1298_REG_CHnSET() is missing parentheses around the parameter 'n'.
Add them to follow kernel macro coding style and prevent potential
operator precedence issues if the argument is an expression.

Signed-off-by: Md Shofiqul Islam <shofiqtest@gmail.com>
Reviewed-by: Stepan Ionichev <sozdayvek@gmail.com>
Acked-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Author: shofiqtest

drivers/iio/adc/ti-ads1298.c

@@ -66,7 +66,7 @@
 #define ADS1298_MASK_CONFIG3_VREF_4V		BIT(5)
 
 #define ADS1298_REG_LOFF	0x04
-#define ADS1298_REG_CHnSET(n)	(0x05 + n)
+#define ADS1298_REG_CHnSET(n)	(0x05 + (n))
 #define ADS1298_MASK_CH_PD		BIT(7)
 #define ADS1298_MASK_CH_PGA		GENMASK(6, 4)
 #define ADS1298_MASK_CH_MUX		GENMASK(2, 0)