Remove two "unused" mbuf tag functions and kill the superfluous argument

to the m_tag_delete_chain() function.
m_tag_free() and m_tag_unlink() are only used by m_tag_delete() and I see
no need to have these functions around.
m_tag_delete_chain() has a second argument to specifiy a starting point
from where the chain should be deleted. This feature is never used and is
more complex because it is not possible to remove a SLIST element without
doing a list walk. Instead use SLIST_FIRST() and SLIST_REMOVE_HEAD() to
remove all items from the list. OK dhartmei@

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