Make count-objects, describe and merge-tree work in subdirectory

Call setup_git_directory() to make these commands work in subdirectory.
Signed-off-by: NDmitry V. Levin <ldv@altlinux.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

describe.c

@@ -161,6 +161,8 @@ int main(int argc, char **argv)
 			usage(describe_usage);
 	}
 
+	setup_git_directory();
+
 	if (i == argc)
 		describe("HEAD", 1);
 	else

git.c

@@ -224,7 +224,7 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
 		{ "checkout-index", cmd_checkout_index, RUN_SETUP },
 		{ "check-ref-format", cmd_check_ref_format },
 		{ "commit-tree", cmd_commit_tree, RUN_SETUP },
-		{ "count-objects", cmd_count_objects },
+		{ "count-objects", cmd_count_objects, RUN_SETUP },
 		{ "diff", cmd_diff, RUN_SETUP },
 		{ "diff-files", cmd_diff_files, RUN_SETUP },
 		{ "diff-index", cmd_diff_index, RUN_SETUP },

merge-tree.c

@@ -340,6 +340,8 @@ int main(int argc, char **argv)
 	if (argc < 4)
 		usage(merge_tree_usage);
 
+	setup_git_directory();
+
 	buf1 = get_tree_descriptor(t+0, argv[1]);
 	buf2 = get_tree_descriptor(t+1, argv[2]);
 	buf3 = get_tree_descriptor(t+2, argv[3]);