[InterNetNews/inn] d990a2: tdx-util: Fix segfault when no article is found

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: d990a2213c8368f36e1cab3e603a804f0af6a72a
      https://github.com/InterNetNews/inn/commit/d990a2213c8368f36e1cab3e603a804f0af6a72a
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2022-06-27 (Mon, 27 Jun 2022)

  Changed paths:
    M storage/tradindexed/tdx-util.c

  Log Message:
  -----------
  tdx-util: Fix segfault when no article is found

search is NULL in that case, and tdx_search_close() expects a non-NULL
argument.