i40iw: Fix incorrect check for error

In i40iw_ieq_handle_partial() the check for !status is incorrect.

Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Henry Orosco <henry.orosco@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>