[php-src] PR #24513: Fix GH-24508: HTTP wrapper leaks dechunk filter when header parsing fails

Pull Request: https://github.com/php/php-src/pull/24513 Author: bercedev Fixes GH-24508 When the response carries Transfer-Encoding: chunked, the header parser creates the dechunk filter in header_info.transfer_encoding. At out: it is only handed to the stream (php_stream_filter_append()) when stream != NULL. If a later header line sets header_info.error, the stream is closed before out: and the filter is never freed. The out: block now frees it in the else branch, where no stream will own it. The redirect path already frees it on its own (and sets it to NULL), so it isn't affected. The new ext/standard/tests/http/gh24508.phpt sends Transfer-Encoding: chunked followed by a header line without a colon. On a debug build (--enable-debug --enable-pcntl --enable-posix) of PHP-8.4 without the fix it fails with: ``` ext/standard/filters.c(1891) : Freeing 0x... (16 bytes), script=.../gh24508.php main/streams/filter.c(269) : Freeing 0x... (80 bytes), script=.../gh24508.php ``` With the fix it passes, and ext/standard/tests/http/ gives 71 passed, 14 skipped, 0 failed. This touches the same file as #24512 (GH-24509), in a different place, so the two don't conflict.