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devmnt: make sure auth chan is on said conection in mntattach()

--- a/sys/src/9/port/devmnt.c

+++ b/sys/src/9/port/devmnt.c

@@ -307,6 +307,9 @@

 	Mnt *m;

 	Mntrpc *r;

+	if(ac != nil && ac->mchan != c)

+		error(Ebadusefd);

+

 	m = c->mux;

 	if(m == nil){

 		mntversion(c, nil, 0, 0);

-- 

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