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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 dbus-server-signals DBus Server Signals

@signals

@signal dbus-method-called

@signal dbus-introspect

@endsignals

@see dbus-server.h

<hr>

@signaldef dbus-method-called

@signalproto

gboolean (*dbus_method_called)(DBusConnection *connection,

DBusMessage *message);

@endsignalproto

@signaldesc

Emitted when a dbus method is going to be called.

@param connection The DBus connection.

@param message The DBus message.

@return TRUE if signal handler handled the method. ???

@endsignaldef

@signaldef dbus-introspect

@signalproto

void (*dbus_introspect)(GList **bidings_list);

@endsignalproto

@signaldesc

???

@param bindings_list ???

@endsignaldef

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