staging: comedi: ni_tio_internal.h: replace NITIO_Gi_ABZ_Reg()

The "ABZ" registers are sequential in the enum ni_gpct_register.
Replace this inline CamelCase function with a simple define.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_tio.c

@@ -1296,7 +1296,7 @@ static int ni_tio_set_other_src(struct ni_gpct *counter, unsigned index,
 	if (counter_dev->variant == ni_gpct_variant_m_series) {
 		unsigned int abz_reg, shift, mask;
 
-		abz_reg = NITIO_Gi_ABZ_Reg(counter->counter_index);
+		abz_reg = NITIO_ABZ_REG(counter->counter_index);
 		switch (index) {
 		case NI_GPCT_SOURCE_ENCODER_A:
 			shift = 10;

drivers/staging/comedi/drivers/ni_tio_internal.h

@@ -36,17 +36,7 @@
 #define NITIO_STATUS2_REG(x)		(NITIO_G01_STATUS2 + ((x) / 2))
 #define NITIO_DMA_CFG_REG(x)		(NITIO_G0_DMA_CFG + (x))
 #define NITIO_DMA_STATUS_REG(x)		(NITIO_G0_DMA_STATUS + (x))
-
-static inline enum ni_gpct_register NITIO_Gi_ABZ_Reg(unsigned idx)
-{
-	switch (idx) {
-	case 0:
-		return NITIO_G0_ABZ;
-	case 1:
-		return NITIO_G1_ABZ;
-	}
-	return 0;
-}
+#define NITIO_ABZ_REG(x)		(NITIO_G0_ABZ + (x))
 
 static inline enum ni_gpct_register NITIO_Gi_Interrupt_Acknowledge_Reg(unsigned idx)
 {