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ip/tinc: fix ping pong racing causing recalcs and deleting nodes

--- a/sys/src/cmd/ip/tinc.c

+++ b/sys/src/cmd/ip/tinc.c

@@ -1301,7 +1301,10 @@

 	while((n = conrecv(c, f, nelem(f))) > 0){

 		switch(atoi(f[0])){

 		case PING:

-			if(consend(c, "%d %x", PONG, rand()) < 0)

+			netlock(c);

+			n = consend(c, "%d %x", PONG, rand());

+			netunlock(c);

+			if(n < 0)

 				return;

 			continue;

 		case PONG:

-- 

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