Ensure proper setup of git_dir for git-hash-object

Call setup_git_directory() before git_config() to make sure git_dir is set
to the proper value.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

hash-object.c

@@ -81,8 +81,6 @@ int main(int argc, const char **argv)
 
 	type = blob_type;
 
-	git_config(git_default_config, NULL);
-
 	argc = parse_options(argc, argv, hash_object_options, hash_object_usage, 0);
 
 	if (write_object) {
@@ -92,6 +90,8 @@ int main(int argc, const char **argv)
 			vpath = prefix_filename(prefix, prefix_length, vpath);
 	}
 
+	git_config(git_default_config, NULL);
+
 	if (stdin_paths) {
 		if (hashstdin)
 			errstr = "Can't use --stdin-paths with --stdin";