* Search through tcb's and update active timers.
*/
ip = slirp->tcb.so_next;
- if (ip == 0)
- return;
+ if (ip == NULL) {
+ return;
+ }
for (; ip != &slirp->tcb; ip = ipnxt) {
ipnxt = ip->so_next;
tp = sototcpcb(ip);
- if (tp == 0)
- continue;
+ if (tp == NULL) {
+ continue;
+ }
for (i = 0; i < TCPT_NTIMERS; i++) {
if (tp->t_timer[i] && --tp->t_timer[i] == 0) {
tcp_timers(tp,i);