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aux/timesync: open /proc/n/ctl with OWRITE, not ORDWR

--- a/sys/src/cmd/aux/timesync.c

+++ b/sys/src/cmd/aux/timesync.c

@@ -817,7 +817,7 @@

 	char buf[32];

 	sprint(buf, "/proc/%d/ctl", getpid());

-	fd = open(buf, ORDWR);

+	fd = open(buf, OWRITE);

 	if(fd < 0){

 		fprint(2, "can't set priority\n");

 		return;