sysctl: clean from unneeded extern and forward declarations

The do_sysctl_strategy isn't used outside kernel/sysctl.c, so this can be
static and without a prototype in header.

Besides, move this one and parse_table() above their callers and drop the
forward declarations of the latter call.

One more "besides" - fix two checkpatch warnings: space before a ( and an
extra space at the end of a line.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Alexey Dobriyan <adobriyan@sw.ru>
Cc: Denis V. Lunev <den@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>