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Fix XkbSetMap when client->swapped

Peter Harris requested to merge peterh/xserver:xkb into master
  1. _XkbSetMapChecks swaps part of the request, and is (potentially) called multiple times. Only swap the request the first time it is called.
  2. _XkbSetMapChecks returns an X status (where 0 means Success). In the case of an error that mistakenly returns 0, the remainder of the request is not checked and can lead to a heap smash.

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