[SCSI] esp_scsi: Use DIV_ROUND_UP

Use the macro DIV_ROUND_UP and eliminate the variable rounded_up, as
suggested by Matthew Wilcox.

Signed-off-by: Julia Lawall <[e-mail]>
Cc: David Miller <[e-mail]>
Reviewed-by: Matthew Wilcox <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/esp_scsi.c

···
 		offset = 0;
 
 	if (offset) {
-		int rounded_up, one_clock;
+		int one_clock;
 
 		if (period > esp->max_period) {
 			period = offset = 0;
···
 			goto do_reject;
 
 		one_clock = esp->ccycle / 1000;
-		rounded_up = (period << 2);
-		rounded_up = (rounded_up + one_clock - 1) / one_clock;
-		stp = rounded_up;
+		stp = DIV_ROUND_UP(period << 2, one_clock);
 		if (stp && esp->rev >= FAS236) {
 			if (stp >= 50)
 				stp--;