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rio: format pid's as ulongs

--- a/sys/src/cmd/rio/wind.c

+++ b/sys/src/cmd/rio/wind.c

@@ -1420,7 +1420,7 @@

 void

 wsetpid(Window *w, int pid, int dolabel)

 {

-	char buf[64];

+	char buf[32];

 	int ofd;

 	ofd = w->notefd;

@@ -1428,11 +1428,11 @@

 		w->notefd = -1;

 	else {

 		if(dolabel){

-			snprint(buf, sizeof(buf), "rc %d", pid);

+			snprint(buf, sizeof(buf), "rc %lud", (ulong)pid);

 			free(w->label);

 			w->label = estrdup(buf);

 		}

-		snprint(buf, sizeof(buf), "/proc/%d/notepg", pid);

+		snprint(buf, sizeof(buf), "/proc/%lud/notepg", (ulong)pid);

 		w->notefd = open(buf, OWRITE|OCEXEC);

 	}

 	if(ofd >= 0)