staging: comedi: drivers: Use DIV_ROUND_CLOSEST

The kernel.h macro DIV_ROUND_CLOSEST performs the computation
`(x +d/2)/d` but is perhaps more readable.

The Coccinelle script used is as follows:
// <smpl>
@@
expression x,__divisor;
@@
- (((x) + ((__divisor) / 2)) / (__divisor))
+ DIV_ROUND_CLOSEST(x,__divisor)
// </smpl>
Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/addi_apci_3xxx.c

@@ -496,7 +496,7 @@ static int apci3xxx_ai_ns_to_timer(struct comedi_device *dev,
 		switch (flags & CMDF_ROUND_MASK) {
 		case CMDF_ROUND_NEAREST:
 		default:
-			timer = (*ns + base / 2) / base;
+			timer = DIV_ROUND_CLOSEST(*ns, base);
 			break;
 		case CMDF_ROUND_DOWN:
 			timer = *ns / base;

drivers/staging/comedi/drivers/amplc_pci230.c

@@ -637,7 +637,7 @@ static unsigned int pci230_divide_ns(uint64_t ns, unsigned int timebase,
 	switch (flags & CMDF_ROUND_MASK) {
 	default:
 	case CMDF_ROUND_NEAREST:
-		div += (rem + (timebase / 2)) / timebase;
+		div += DIV_ROUND_CLOSEST(rem, timebase);
 		break;
 	case CMDF_ROUND_DOWN:
 		break;

drivers/staging/comedi/drivers/cb_pcidas64.c

@@ -1376,7 +1376,7 @@ static int set_ai_fifo_segment_length(struct comedi_device *dev,
 		num_entries = fifo->max_segment_length;
 
 	/*  1 == 256 entries, 2 == 512 entries, etc */
-	num_increments = (num_entries + increment_size / 2) / increment_size;
+	num_increments = DIV_ROUND_CLOSEST(num_entries, increment_size);
 
 	bits = (~(num_increments - 1)) & fifo->fifo_size_reg_mask;
 	devpriv->fifo_size_bits &= ~fifo->fifo_size_reg_mask;
@@ -2004,7 +2004,7 @@ static unsigned int get_divisor(unsigned int ns, unsigned int flags)
 		break;
 	case CMDF_ROUND_NEAREST:
 	default:
-		divisor = (ns + TIMER_BASE / 2) / TIMER_BASE;
+		divisor = DIV_ROUND_CLOSEST(ns, TIMER_BASE);
 		break;
 	}
 	return divisor;

drivers/staging/comedi/drivers/dt282x.c

@@ -371,7 +371,7 @@ static unsigned int dt282x_ns_to_timer(unsigned int *ns, unsigned int flags)
 		switch (flags & CMDF_ROUND_MASK) {
 		case CMDF_ROUND_NEAREST:
 		default:
-			divider = (*ns + base / 2) / base;
+			divider = DIV_ROUND_CLOSEST(*ns, base);
 			break;
 		case CMDF_ROUND_DOWN:
 			divider = (*ns) / base;

drivers/staging/comedi/drivers/dt3000.c

@@ -361,7 +361,7 @@ static int dt3k_ns_to_timer(unsigned int timer_base, unsigned int *nanosec,
 		switch (flags & CMDF_ROUND_MASK) {
 		case CMDF_ROUND_NEAREST:
 		default:
-			divider = (*nanosec + base / 2) / base;
+			divider = DIV_ROUND_CLOSEST(*nanosec, base);
 			break;
 		case CMDF_ROUND_DOWN:
 			divider = (*nanosec) / base;

drivers/staging/comedi/drivers/ni_pcidio.c

@@ -525,7 +525,7 @@ static int ni_pcidio_ns_to_timer(int *nanosec, unsigned int flags)
 	switch (flags & CMDF_ROUND_MASK) {
 	case CMDF_ROUND_NEAREST:
 	default:
-		divider = (*nanosec + base / 2) / base;
+		divider = DIV_ROUND_CLOSEST(*nanosec, base);
 		break;
 	case CMDF_ROUND_DOWN:
 		divider = (*nanosec) / base;