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don't close fd 2 when calling mcfs

--- a/stream_mc.c

+++ b/stream_mc.c

@@ -11,7 +11,7 @@

 static int

 mcfs(char **argv, int *pipefd)

 {

-	int p[2], pid, fd;

+	int p[2], pid;

 	pipe(p);

 	if((pid = rfork(RFFDG|RFPROC)) == 0){

@@ -18,10 +18,6 @@

 		close(0);

 		close(p[0]);

 		dup(p[1], 1); close(p[1]);

-		if(!debug){

-			dup(fd = open("/dev/null", OWRITE), 2);

-			close(fd);

-		}

 		exec("/bin/mcfs", argv);

 		sysfatal("exec: %r");

 	}