mISDN: Minor cleanups

Signed-off-by: Andreas Eversberg <andreas@eversberg.eu>
Signed-off-by: Karsten Keil <kkeil@suse.de>
diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index 8df12bf..2db0649 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -2333,10 +2333,10 @@
 		poll = HFCPCI_BTRANS_THRESHOLD;
 
 	if (poll != HFCPCI_BTRANS_THRESHOLD) {
-		tics = poll * HZ / 8000;
+		tics = (poll * HZ) / 8000;
 		if (tics < 1)
 			tics = 1;
-		poll = tics * 8000 / HZ;
+		poll = (tics * 8000) / HZ;
 		if (poll > 256 || poll < 8) {
 			printk(KERN_ERR "%s: Wrong poll value %d not in range "
 				"of 8..256.\n", __func__, poll);