module: guard against null return from xcb_get_extension_data() #180
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see comment for details... this probably doesn't really occur in the wild very much, but we uncovered it in our parallel testing, and didn't quite get it fixed in d3c25ee ("module: be less strange about extension key lifetimes") (although that was probably also a bug and a nice cleanup anyway at net negative lines, this is likely the real source of the seg fault).