Clean up GCC build warnings

tests-clar/object/tree/attributes.c

@@ -45,8 +45,7 @@ void test_object_tree_attributes__treebuilder_reject_invalid_filemode(void)
 {
 	git_repository *repo;
 	git_treebuilder *builder;
-	git_oid bid, tid;
-	git_tree *tree;
+	git_oid bid;
 	const git_tree_entry *entry;
 
 	repo = cl_git_sandbox_init("deprecated-mode.git");

tests-clar/refs/branches/tracking.c

@@ -65,7 +65,7 @@ static void assert_merge_and_or_remote_key_missing(git_repository *repository, c
 {
 	git_reference *branch;
 
-	cl_assert_equal_i(GIT_OBJ_COMMIT, git_object_type(target));
+	cl_assert_equal_i(GIT_OBJ_COMMIT, git_object_type((git_object*)target));
 	cl_git_pass(git_branch_create(&branch, repository, entry_name, (git_commit*)target, 0));
 
 	cl_assert_equal_i(GIT_ENOTFOUND, git_branch_tracking(&tracking, branch));