* use M_ZERO flag with malloc instead of explicit zeroing.
* remove MULTI_SCOPE ifdef.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271426 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f