i40iw: do not print unitialized variables in error message

i40iw_create_cqp() printed the contents of variables maj_err and min_err
in an error message before they could be initialized (by calling
dev->cqp_ops->cqp_create).

Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>