MFV r274272 and diff reduction with upstream.

Illumos issue:
    5244 zio pipeline callers should explicitly invoke next stage

Tested with:	ztest plus ZFS over GELI configuration
MFC after:	1 month


git-svn-id: svn+ssh://svn.freebsd.org/base/head@274304 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f