selftests/arm64: GCS must not leak on a failed clone3 KTAP coverage for clone3(CLONE_VM|CLONE_PIDFD) with a bad pidfd pointer: sixteen failures must not grow the parent's GCS VMA count. Assisted-by: LLM Signed-off-by: Iván Ezequiel Rodriguez <ivanrwcm25@gmail.com> Reviewed-by: Mark Brown <broonie@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>