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libdraw: dont postnote to pid==0 in ekill()

--- a/sys/src/libdraw/event.c

+++ b/sys/src/libdraw/event.c

@@ -369,7 +369,7 @@

 	pid = getpid();

 	for(i=0; i<nslave; i++){

-		if(pid == eslave[i].pid)

+		if(eslave[i].pid == 0 || pid == eslave[i].pid)

 			continue;	/* don't kill myself */

 		postnote(PNPROC, eslave[i].pid, "die");

 	}