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pexec: instead of closing stderr, redirect it to /dev/null

--- a/util.c

+++ b/util.c

@@ -23,6 +23,7 @@

 pexec(void *args)

 {

 	Exec *e = args;

+	int fd;

 	if(e->p[0] >= 0){

 		dup(e->p[Them], 0);

@@ -33,8 +34,10 @@

 		close(0);

 		close(1);

 	}

-	if(debug < 1)

-		close(2);

+	if(debug < 1){

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

+		close(fd);

+	}

 	procexec(e->pid, e->file, e->argv);

 }