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rc: fix double close() in addenv()

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

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

@@ -273,12 +273,10 @@

 		if((f = Creat(envname))<0)

 			pfmt(err, "rc: can't open %s: %r\n", envname);

 		else{

-			if(v->fn){

-				fd = openfd(f);

+			fd = openfd(f);

+			if(v->fn)

 				pfmt(fd, "fn %q %s\n", v->name, v->fn[v->pc-1].s);

-				closeio(fd);

-			}

-			close(f);

+			closeio(fd);

 		}

 	}

 }