remove some unused warnings

src/attr.c

@@ -251,7 +251,6 @@ static int preload_attr_file(
 
 static int system_attr_file(
 	git_buf *out,
-	git_repository *repo,
 	git_attr_session *attr_session)
 {
 	int error;
@@ -306,7 +305,7 @@ static int attr_setup(git_repository *repo, git_attr_session *attr_session)
 	 * definitions will be available for later file parsing
 	 */
 
-	error = system_attr_file(&sys, repo, attr_session);
+	error = system_attr_file(&sys, attr_session);
 
 	if (error == 0)
 		error = preload_attr_file(
@@ -526,7 +525,7 @@ static int collect_attr_files(
 	}
 
 	if ((flags & GIT_ATTR_CHECK_NO_SYSTEM) == 0) {
-		error = system_attr_file(&dir, repo, attr_session);
+		error = system_attr_file(&dir, attr_session);
 
 		if (!error)
 			error = push_attr_file(

tests/checkout/tree.c

@@ -1137,6 +1137,10 @@ void update_attr_callback(
 	size_t total_steps,
 	void *payload)
 {
+	GIT_UNUSED(completed_steps);
+	GIT_UNUSED(total_steps);
+	GIT_UNUSED(payload);
+
 	if (path && strcmp(path, "ident1.txt") == 0)
 		cl_git_write2file("testrepo/.gitattributes",
 			"*.txt ident\n", 12, O_RDWR|O_CREAT, 0666);