[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

            Bug ID: 283315
           Summary: if_ffec receive packet size in mbuf header is not
                    properly adjusted and is 2 bytes too large.
           Product: Base System
           Version: 13.4-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: mibelanger@qnx.com

In ffec_rxfinish_onebuf, there is code to adjust the start of the data, but the
size is not properly adjusted.
tcpdump can be used to see the extra 2 bytes on receive packets.

The following should resolve the issue.

        if (sc->fecflags & FECFLAG_RACC) {
                m->m_data = mtod(m, uint8_t *) + 2;
>>>>>>
                m->m_len -= 2;
                m->m_pkthdr.len -= 2;
>>>>>>
        } else {
                src = mtod(m, uint8_t*);
                dst = src - ETHER_ALIGN;
                bcopy(src, dst, len);
                m->m_data = dst;
        }

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