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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 cmd-signals Command Signals

@signals

@signal cmd-added

@signal cmd-removed

@endsignals

@see cmds.h

@signaldef cmd-added

@signalproto

void (*cmd_added)(const char *command, PurpleCmdPriority priority,

PurpleCmdFlag flag);

@endsignalproto

@signaldesc

Emitted when a new command is added.

@param command The new command.

@param priority The priority of the new command.

@param flag The command flags.

@endsignaldef

@signaldef cmd-removed

@signalproto

void (*cmd_removed)(const char *command);

@endsignalproto

@signaldesc

Emitted when a command is removed.

@param command The removed command.

@endsignaldef

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