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libauth: fix mount file-descriptor leak in auth_chuid()

--- a/sys/src/libauth/auth_chuid.c

+++ b/sys/src/libauth/auth_chuid.c

@@ -30,8 +30,10 @@

 	/* get a link to factotum as new user */

 	fd = open("/srv/factotum", ORDWR);

-	if(fd >= 0)

+	if(fd >= 0){

 		mount(fd, -1, "/mnt", MREPL, "");

+		close(fd);

+	}

 	/* set up new namespace */

 	return newns(ai->cuid, ns);

-- 

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