[PATCH] fetch.c: Clean up object flag definitions

Remove holes left after deleting flags, and use shifts to emphasize
that flags are single bits.

Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
Signed-off-by: Junio C Hamano <junkio@cox.net>

fetch.c

@@ -54,9 +54,9 @@ static int process_tree(struct tree *tree)
 	return 0;
 }
 
-#define COMPLETE	1U
-#define TO_SCAN		4U
-#define SEEN		16U
+#define COMPLETE	(1U << 0)
+#define SEEN		(1U << 1)
+#define TO_SCAN		(1U << 2)
 
 static struct commit_list *complete = NULL;