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rc: add err != nil check for early exit

--- a/sys/src/cmd/rc/plan9.c

+++ b/sys/src/cmd/rc/plan9.c

@@ -249,7 +249,8 @@

 			addenv(v);

 	if(runq)

 		updenvlocal(runq->local);

-	flushio(err);

+	if(err)

+		flushio(err);

 }

 void