mbuf m_flags size too small

["Sepherosa Ziehau" <sepherosa@xxxxxxxxx>]

Hi,

I think when we brought in sctp support (M_NOTIFICATION 0x10000), our
mbuf.m_flags' size(16bits currently) should have grown.
Following patch fixes this:
http://leaf.dragonflybsd.org/~sephe/mbuf.h.diff

Please review it.  If no objection comes, it will be committed two days later.

Best Regards,
sephe

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