locks: Remove unnecessary IS_POSIX test
locks: Remove unnecessary IS_POSIX test

Since following change

commit bd61e0a9c852de2d705b6f1bb2cc54c5774db570
Author: Jeff Layton <4376fbf8623cd7b7c0232225289bb91cedc0a27f@primarydata.com>
Date:   Fri Jan 16 15:05:55 2015 -0500

    locks: convert posix locks to file_lock_context

all Posix locks are kept on their a separate list, so the test is
redudant.

Signed-off-by: Daniel Wagner <53566a40310e7120a373d88c94d924839fd4b1fa@bmw-carit.de>
Cc: Jeff Layton <4376fbf8623cd7b7c0232225289bb91cedc0a27f@primarydata.com>
Cc: "J. Bruce Fields" <51738506c1b2ccb0761f23bdc612c93babf738ea@fieldses.org>
Cc: Alexander Viro <de609eb4d5d70b1d38ec6642adbfc33a2781f63c@zeniv.linux.org.uk>
Signed-off-by: Jeff Layton <542dfe392278ff3cf017aafde9d989e8068d5c3e@primarydata.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs