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rudp: better newgen() function, avoiding the lock

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

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

@@ -766,17 +766,12 @@

 static ulong

 newgen(void)

 {

-	static Lock lk;

 	static ulong gen = 0;

-	ulong r;

-	lock(&lk);

 	while(gen == 0 || gen == Hangupgen)

 		gen = (nrand(1<<16)<<16)|nrand(1<<16);

-	r = gen++;

-	unlock(&lk);

-	return r;

+	return gen++;

 }

 /*