Don't call XInput_find_display in _XiCheckExtInit, while the Display lock is held.
All callers of _XiCheckExtInit have already called XInput_find_display first outside the lock, so just pass their copy of the XExtDisplayInfo structure down. Besides being more correct, this should be slightly faster. :-) Thanks to Magnus Kessler <Magnus.Kessler@gmx.net> for identifying the bug and proposing a workaround.
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