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upas/fs: lock mbox in syncallmboxes() to avoid assert crash

--- a/sys/src/cmd/upas/fs/mbox.c

+++ b/sys/src/cmd/upas/fs/mbox.c

@@ -273,9 +273,12 @@

 	Mailbox *m;

 	qlock(&mbllock);

-	for(m = mbl; m != nil; m = m->next)

+	for(m = mbl; m != nil; m = m->next){

+		qlock(m);

 		if(err = syncmbox(m, 1))

 			eprint("syncmbox: %s\n", err);

+		qunlock(m);

+	}

 	qunlock(&mbllock);

 }