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devip: cleanup tcp.c

--- a/sys/src/9/ip/tcp.c

+++ b/sys/src/9/ip/tcp.c

@@ -3229,8 +3229,7 @@

 		v4tov6(source, h4->tcpsrc);

 		psource = nhgets(h4->tcpsport);

 		pdest = nhgets(h4->tcpdport);

-	}

-	else {

+	} else {

 		ipmove(dest, h6->tcpdst);

 		ipmove(source, h6->tcpsrc);

 		psource = nhgets(h6->tcpsport);

@@ -3239,8 +3238,7 @@

 	/* Look for a connection */

 	qlock(tcp);

-	for(p = tcp->conv; *p; p++) {

-		s = *p;

+	for(p = tcp->conv; (s = *p) != nil; p++) {

 		tcb = (Tcpctl*)s->ptcl;

 		if(s->rport == pdest)

 		if(s->lport == psource)