Fix qid generation for root so you can dotdot
out of a page directory (e.g. /n/wiki/sandbox).

I think this is the same idea as Russ's recent
patch to devsd.c.

Notes:
Sun Sep 4 08:09:29 EDT 2005 rsc
    One wonders what 42 means!
    


Reference: /n/sources/patch/applied/wikifs-dotdot
Date: Sun Sep  4 09:49:31 CES 2005
Reviewed-by: rsc

--- /sys/src/cmd/wikifs/fs.c	Sun Sep  4 09:47:43 2005
+++ /sys/src/cmd/wikifs/fs.c	Sun Sep  4 09:47:42 2005
@@ -109,7 +109,7 @@
 	r->fid->aux = a;
 	a->name = s_copy(r->ifcall.uname);
 
-	r->ofcall.qid = (Qid){mkqid(Droot, 0, 0, 42), 0, QTDIR};
+	r->ofcall.qid = (Qid){mkqid(Droot, 0, 0, 0), 0, QTDIR};
 	r->fid->qid = r->ofcall.qid;
 	respond(r, nil);
 }