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Fix leak that may occur when xmlnode_from_str fails
release-2.x.y
2021-09-13, Elliott Sales de Andrade

59a77978ca08

Fix leak that may occur when xmlnode_from_str fails

The failure may occur any time in the middle of parsing, and `xpd->current` may
not actually be pointing to the root of the parsed tree. Thus we need to walk
back up before freeing the xmlnode.

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=34988

Testing Done:
Ran the reproducer testcase on `fuzz_xml`

Reviewed at https://reviews.imfreedom.org/r/911/

/** @page core-signals Core Signals

@signals

@signal quitting

@signal uri-handler

@endsignals

@see core.h

<hr>

@signaldef quitting

@signalproto

void (*quitting)();

@endsignalproto

@signaldesc

Emitted when libpurple is quitting.

@endsignaldef

@signaldef uri-handler

@signalproto

gboolean (*uri_handler)(const gchar *proto, const gchar *cmd, GHashTable *params);

@endsignalproto

@signaldesc

Emitted when handling a registered URI.

@param proto The protocol of the URI.

@param cmd The 'command' of the URI.

@param params Any key/value parameters from the URI.

@endsignaldef

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