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fix refs on empty dir

we were not increasing the reference count
on the empty directory when returning it,
so we would eventually release it twice.
oops.

--- a/fs.c

+++ b/fs.c

@@ -237,9 +237,9 @@

 	aux = p;

 	c = crumb(aux, 0);

 	e = c->obj;

-	m = e->tree->ent[i].mode;

 	if(i >= e->tree->nent)

 		return -1;

+	m = e->tree->ent[i].mode;

 	if(e->tree->ent[i].ismod)

 		o = emptydir();

 	else if((o = readobject(e->tree->ent[i].h)) == nil)

--- a/util.c

+++ b/util.c

@@ -13,7 +13,7 @@

 	static Object *e;

 	if(e != nil)

-		return e;

+		return ref(e);

 	e = emalloc(sizeof(Object));

 	e->hash = Zhash;

 	e->type = GTree;