Eliminate use of M_EXT in IP6_EXTHDR_CHECK() by trimming a redundant
'if'/'else' case: it matches the simple 'else' case that follows.

This reduces awareness of external-storage mechanics outside of the
mbuf allocator.

Reviewed by:	bz
MFC after:	3 days
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D900


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272559 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f