object: allow object_as_type to handle arbitrary repositories

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

object.c

@@ -158,13 +158,13 @@ void *create_object(struct repository *r, const unsigned char *sha1, void *o)
 	return obj;
 }
 
-void *object_as_type_the_repository(struct object *obj, enum object_type type, int quiet)
+void *object_as_type(struct repository *r, struct object *obj, enum object_type type, int quiet)
 {
 	if (obj->type == type)
 		return obj;
 	else if (obj->type == OBJ_NONE) {
 		if (type == OBJ_COMMIT)
-			((struct commit *)obj)->index = alloc_commit_index(the_repository);
+			((struct commit *)obj)->index = alloc_commit_index(r);
 		obj->type = type;
 		return obj;
 	}

object.h

@@ -114,8 +114,7 @@ struct object *lookup_object_the_repository(const unsigned char *sha1);
 
 extern void *create_object(struct repository *r, const unsigned char *sha1, void *obj);
 
-#define object_as_type(r, o, t, q) object_as_type_##r(o, t, q)
-void *object_as_type_the_repository(struct object *obj, enum object_type type, int quiet);
+void *object_as_type(struct repository *r, struct object *obj, enum object_type type, int quiet);
 
 /*
  * Returns the object, having parsed it to find out what it is.