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walk: include qid version in deduplication

the qid version is part of the qid, take it into account
for deduplication.

--- a/sys/src/cmd/walk.c

+++ b/sys/src/cmd/walk.c

@@ -307,10 +307,11 @@

 	int i;

 	Cache *c;

-	c = &cache[dir->qid.path&(NCACHE-1)];

+	c = &cache[(dir->qid.path^dir->qid.vers)&(NCACHE-1)];

 	dp = c->cache;

 	for(i=0; i<c->n; i++, dp++)

 		if(dir->qid.path == dp->qid.path &&

+		   dir->qid.vers == dp->qid.vers &&

 		   dir->type == dp->type &&

 		   dir->dev == dp->dev)

 			return 1;