Don't remove the first mbuf in the chain if it got empty. This removes the packet header in certain cases which later on will give panic. Clarify what the atm_intr expects in the comment and de-obscurify the code a little bit by replacing the portability macros with the BSD names. The code isn't maintained externally anymore so there's no point in keeping the extra level of obscurity.
Don't remove the first mbuf in the chain if it got empty.
This removes the packet header in certain cases which later on
will give panic. Clarify what the atm_intr expects in the comment
and de-obscurify the code a little bit by replacing the portability
macros with the BSD names. The code isn't maintained externally anymore
so there's no point in keeping the extra level of obscurity.

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