Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

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>