New release 4.2.22

Fixed build on Linux kernel 6.3 and newer.

Fixed bugs that occurred when changing IRIG settings:

  - Support of the TFOM flag was incorrectly always checked against
    the timecode format configured for the timecode *output*, so setting
    the flag for the input happened to be accepted, or not.

  - Before trying to save the configuration of the timecode *output*,
    it was incorrectly checked for the presence of a timecode *input*,
    so saving the configuration of the output of a device failed
    if the device did not also have an input.

  - When about to save IRIG *input* settings, the presence of a timecode
    *output* was incorrectly checked instead of the presence of a timecode input,
    so the call succeeded only if the device also had a timecode output.

Check and fix configuration reported by early TCR180USB versions:

  - The RECEIVER_INFO of those versions claims to provide serial ports with
    configurable string types, though the firmware doesn't support the API.
    The probe routine of the kernel driver now adjusts the RECEIVER_INFO,
    if required, to fix this.

  - For this to work, the user-space API call that retrieves the RECEIVER_INFO
    now returns the potentially modified instance stored in the kernel driver,
    rather than reading the structure directly from the device.

Improved detection of the 'clear ucap buffer' feature with some new devices.

Increased string buffer for XMR status info, so the string possibly displayed
by mbgstatus is not truncated.

Instead of using feature check *macros*, generally use feature check *functions*
which always retrieve the information from the kernel driver.

mbgsvcd doesn't enter holdover mode anymore if device has no valid time.

Changed copyright year to 2023.
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