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tcp: memset paranoia, synced from sources

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

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

@@ -1345,6 +1345,7 @@

 		return commonerror();

 	if(ipcmp(s->raddr, IPnoaddr) != 0) {

 		if(!waserror()){

+			memset(&seg, 0, sizeof seg);

 			seg.flags = RST | ACK;

 			seg.ack = tcb->rcv.nxt;

 			tcb->rcv.una = 0;

@@ -1413,6 +1414,7 @@

 		panic("sndrst: version %d", lp->version);

 	}

+	memset(&seg, 0, sizeof seg);

 	seg.seq = lp->iss;

 	seg.ack = lp->irs+1;

 	seg.flags = SYN|ACK;

@@ -1960,6 +1962,7 @@

 	h4 = (Tcp4hdr*)(bp->rp);

 	h6 = (Tcp6hdr*)(bp->rp);

+	memset(&seg, 0, sizeof seg);

 	if((h4->vihl&0xF0)==IP_VER4) {

 		version = V4;

@@ -2445,6 +2448,7 @@

 	f = s->p->f;

 	tpriv = s->p->priv;

 	version = s->ipversion;

+	memset(&seg, 0, sizeof seg);

 	for(msgs = 0; msgs < 100; msgs++) {

 		tcb = (Tcpctl*)s->ptcl;

@@ -2657,6 +2661,7 @@

 	tcb = (Tcpctl*)s->ptcl;

 	dbp = nil;

+	memset(&seg, 0, sizeof seg);

 	seg.urg = 0;

 	seg.source = s->lport;

 	seg.dest = s->rport;