t/helper: merge test-dump-cache-tree into test-tool

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/helper/test-dump-cache-tree.c b/t/helper/test-dump-cache-tree.c
index ebf3aab..98a4891 100644
--- a/t/helper/test-dump-cache-tree.c
+++ b/t/helper/test-dump-cache-tree.c
@@ -1,3 +1,4 @@
+#include "test-tool.h"
 #include "cache.h"
 #include "tree.h"
 #include "cache-tree.h"
@@ -54,7 +55,7 @@ static int dump_cache_tree(struct cache_tree *it,
 	return errs;
 }
 
-int cmd_main(int ac, const char **av)
+int cmd__dump_cache_tree(int ac, const char **av)
 {
 	struct index_state istate;
 	struct cache_tree *another = cache_tree();