pack-bitmap: uninteresting oid can be outside bitmapped packfile

bitmap_has_oid_in_uninteresting() only used bitmap_position_packfile(),
not bitmap_position(). So it wouldn't find objects which weren't in the
bitmapped packfile (i.e., ones where we extended the bitmap to handle
loose objects, or objects in other packs).

As we could reuse a delta against such an object it is suboptimal not
to use bitmap_position(), so let's use it instead of
bitmap_position_packfile().

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

pack-bitmap.c

@@ -1139,7 +1139,7 @@ int bitmap_has_oid_in_uninteresting(struct bitmap_index *bitmap_git,
 	if (!bitmap_git->haves)
 		return 0; /* walk had no "haves" */
 
-	pos = bitmap_position_packfile(bitmap_git, oid);
+	pos = bitmap_position(bitmap_git, oid);
 	if (pos < 0)
 		return 0;