Ensure we malloc the BuxtonBackend
Ensure we malloc the BuxtonBackend

Credit to William for discovering this, null pointer was being
passed to the modules when initialising them.

Signed-off-by: Michael Ikey Doherty <15e2f59c60e9d84348e78a87e24660774f739add@intel.com>

sofar/buxton,sofar/buxton