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

The "Interrupt Acknowledge" 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_internal.h

@@ -37,21 +37,7 @@
 #define NITIO_DMA_CFG_REG(x)		(NITIO_G0_DMA_CFG + (x))
 #define NITIO_DMA_STATUS_REG(x)		(NITIO_G0_DMA_STATUS + (x))
 #define NITIO_ABZ_REG(x)		(NITIO_G0_ABZ + (x))
-
-static inline enum ni_gpct_register NITIO_Gi_Interrupt_Acknowledge_Reg(unsigned idx)
-{
-	switch (idx) {
-	case 0:
-		return NITIO_G0_INT_ACK;
-	case 1:
-		return NITIO_G1_INT_ACK;
-	case 2:
-		return NITIO_G2_INT_ACK;
-	case 3:
-		return NITIO_G3_INT_ACK;
-	}
-	return 0;
-}
+#define NITIO_INT_ACK_REG(x)		(NITIO_G0_INT_ACK + (x))
 
 static inline enum ni_gpct_register NITIO_Gi_Status_Reg(unsigned idx)
 {

drivers/staging/comedi/drivers/ni_tiocmd.c

@@ -397,7 +397,7 @@ void ni_tio_acknowledge_and_confirm(struct ni_gpct *counter, int *gate_error,
 	}
 	if (ack)
 		write_register(counter, ack,
-			       NITIO_Gi_Interrupt_Acknowledge_Reg
+			       NITIO_INT_ACK_REG
 			       (counter->counter_index));
 	if (ni_tio_get_soft_copy
 	    (counter,