- Fix argument list after 271387.
- While here fix typo.

Submitted by:	markj


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271455 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Initialize variables before resource_int_value().

Submitted by:	Dmitry Luhtionov <dmitryluhtionov@gmail.com>


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271457 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
- Provide a sleepable lock to protect against ioctl() vs ioctl() races.
- Use the new lock to protect against simultaneous DIOCSTART and/or
  DIOCSTOP ioctls.

Reported & tested by:	jmallett
Sponsored by:		Nginx, Inc.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271458 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f