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netinet*: Add assertions for some places that don't support M_EXTPG mbufs

Description

netinet*: Add assertions for some places that don't support M_EXTPG mbufs

Found while auditing calls to M_WRITABLE to see if M_EXTPG could be
removed from its checks.

Reviewed by: gallatin
Differential Revision: https://reviews.freebsd.org/D46785

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