Remove check to see if SEEK_SET is defined before using it

Other references to SEEK_SET in this file are made without checking,
since they assume everyone has either reached C89 by now or will use
the fallback #define at the top of the file, so we can stop checking
here as well.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Remove unnecessary check.

The vmods member of XkbNamesPtr is an array and thus never NULL.

Signed-off-by: Thomas Klausner <wiz@NetBSD.org>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>