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Add additional safeguards

Co-authored-by: Voyager1

Another low hanging fruit, just some small safeguards we have had for a long time. Won't likely fix anything but at least make the lib handling a bit more robust:

  • Checks for nullptr in dvdnav_get_restrictions
  • Avoids decreasing the usage_count in the hypothetical case the code path gots there and its value is 0 or below

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