Fix displaying non-contiguous netmasks.

Found by:	ae
Sponsored by:	Yandex LLC


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273586 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Remove redundant check and m_pullup() call.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273587 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f