git: if_iwm: Apply some changes from OpenBSD, if_iwm.c rev 1.39 -> 1.42

[Sepherosa Ziehau]

On Fri, Jan 1, 2016 at 7:02 AM, Imre Vadasz
<ivadasz at crater.dragonflybsd.org> wrote:
>
> commit 352c1ce92aec690a8469da6d4702a3647b813e67
> Author: Imre Vadász <imre at vdsz.com>
> Date:   Wed Dec 30 17:01:11 2015 +0100
>
>     if_iwm: Apply some changes from OpenBSD, if_iwm.c rev 1.39 -> 1.42
>
>     - Use m_defrag(9) instead of rolling our own version of it.

You could just use bus_dmamap_load_mbuf_defrag() instead of
bus_dmamap_load_mbuf_segment()+m_defrag().

Thanks,
sephe