The pf2vf_resp_wq is a global so it has to be created at init
and destroyed at exit, instead of per device.

Cc: <stable@vger.kernel.org>
Tested-by: Suresh Marikkannu <sureshx.marikkannu@intel.com>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>