HGKeeper

Fix an assert in purple_markup_html_to_xhtml
release-2.x.y
2021-09-15, Elliott Sales de Andrade

cb21c7484e4c

Fix an assert in purple_markup_html_to_xhtml

While `g_string_free` is NULL-safe, the assert for passing it in breaks
ossfuzz. This can happen if there is no `src=` in the `img` as expected.

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35029

Testing Done:
Ran the test case from the bug against `fuzz_html_to_xhtml`

Reviewed at https://reviews.imfreedom.org/r/921/

/** @page plugin-signals Plugin Signals

@signals

@signal plugin-load

@signal plugin-unload

@endsignals

@see plugin.h

<hr>

@signaldef plugin-load

@signalproto

void (*plugin_load)(PurplePlugin *plugin);

@endsignalproto

@signaldesc

Emitted when a plugin is loaded.

@param plugin The plugin that was loaded.

@endsignaldef

@signaldef plugin-unload

@signalproto

void (*plugin_unload)(PurplePlugin *plugin);

@endsignalproto

@signaldesc

Emitted when a plugin is unloaded.

@param plugin The plugin that was unloaded.

@endsignaldef

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