[Bug 283315] if_ffec receive packet size in mbuf header is not properly adjusted and is 2 bytes too large.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283315

--- Comment #1 from Mike Belanger <mibelanger@qnx.com> ---
The following would be better, i.e. use m_adj instead of modifying m->m_data:

        if (sc->fecflags & FECFLAG_RACC) {
-               m->m_data = mtod(m, uint8_t *) + 2;
+               m_adj(m, 2);

        } else {
                src = mtod(m, uint8_t*);
                dst = src - ETHER_ALIGN;
                bcopy(src, dst, len);
                m->m_data = dst;
        }

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