make test-suite outputs some errors

[perlpunk]

Tests succeed, but I get these errors:

make -C tests/run-test-suite test
make[1]: Entering directory '/tmp/libyaml/tests/run-test-suite'
git branch --track run-test-suite-code origin/run-test-suite-code
fatal: A branch named 'run-test-suite-code' already exists.
Makefile:28: recipe for target 'code' failed
make[1]: [code] Error 128 (ignored)
git worktree prune
git worktree add test run-test-suite-code
fatal: 'test' already exists
Makefile:28: recipe for target 'code' failed
make[1]: [code] Error 128 (ignored)
(cd test && git reset --hard c0a4e7a388658bffa53078a6ac28b3d2e118861b)
HEAD is now at c0a4e7a Initial commit
prove -lv test
test/libyaml-emitter.t .......
ok 1 229Q: Spec Example 2.4. Sequence of Mappings
...