i40e/i40evf: assure clean asq status report

i40e/i40evf: assure clean asq status report

There was a possibility where the asq_last_status could get through without
update and thus report a previous error.  I don't think we've actually seen
this happen, but this patch will help make sure it doesn't.

Change-ID: I9e33927052a5ee6ea21f80b66d4c4b76c2760b17
Signed-off-by: Shannon Nelson <[email protected]>
Signed-off-by: Christopher Pau <[email protected]>
Tested-by: Andrew Bowers <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>