use setup_git_directory() in test-* programs

Some of the test-* programs rely on examining refs, but did
not bother to make sure we are actually in a git repository.
Let's have them call setup_git_directory() to do so.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

test-match-trees.c

@@ -6,6 +6,8 @@ int main(int ac, char **av)
 	unsigned char hash1[20], hash2[20], shifted[20];
 	struct tree *one, *two;
 
+	setup_git_directory();
+
 	if (get_sha1(av[1], hash1))
 		die("cannot parse %s as an object name", av[1]);
 	if (get_sha1(av[2], hash2))

test-revision-walking.c

@@ -50,6 +50,8 @@ int main(int argc, char **argv)
 	if (argc < 2)
 		return 1;
 
+	setup_git_directory();
+
 	if (!strcmp(argv[1], "run-twice")) {
 		printf("1st\n");
 		if (!run_revision_walk())