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git/query: fix ref range refcount

Because we now unref objects, they can fall out
of cache. Reload them if needed.

--- a/ref.c

+++ b/ref.c

@@ -50,16 +50,20 @@

 objdatecmp(void *pa, void *pb)

 {

 	Object *a, *b;

+	int r;

-	a = *(Object**)pa;

-	b = *(Object**)pb;

+	a = readobject((*(Object**)pa)->hash);

+	b = readobject((*(Object**)pb)->hash);

 	assert(a->type == GCommit && b->type == GCommit);

 	if(a->commit->mtime == b->commit->mtime)

-		return 0;

+		r = 0;

 	else if(a->commit->mtime < b->commit->mtime)

-		return -1;

+		r = -1;

 	else

-		return 1;

+		r = 1;

+	unref(a);

+	unref(b);

+	return r;

 }

 void