Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix typo.

Submitted by: ae

Improve example, so that it doesn't dump core when example module
isn't loaded.

Fix the syscall module name after r205320.

Submitted by: Vladislav Movchan <vladislav.movchan gmail com>
MFC after: 1 week

Small cleanup while being here:
- sort includes
- remove usage(), since it seems to come from older version
of the KLD
- remove unnecessary variable
- mark argc/argv as unused

Bring WARNS = 5 to the Makefile.

Include stdlib.h for exit(3) and unistd.h for syscall(2). This makes
this program to compile cleanly.

$Id$ -> $FreeBSD$

Use modstat(2) to get the syscall number.

Replace the misc example with a simpler syscall example using the new
module registration hooks for syscalls.

Submitted by: Assar Westerlund <assar@sics.se>