- Don't pass in MTX_NORECURSE, as that is only used with spin mutexes and   is going away soon anyways.  Instead, don't pass MTX_RECURSE to mtx_init,   so that WITNESS will panic if the driver mutex is recursed on. - Use MTX_DEF in mtx_init() instead of assuming that it will be 0.
- Don't pass in MTX_NORECURSE, as that is only used with spin mutexes and
  is going away soon anyways.  Instead, don't pass MTX_RECURSE to mtx_init,
  so that WITNESS will panic if the driver mutex is recursed on.
- Use MTX_DEF in mtx_init() instead of assuming that it will be 0.

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