Let's remove unnecessary brackets around CONFIG_AF_UNIX_OOB.
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Link: https://lore.kernel.org/r/20220317032308.65372-1-kuniyu@amazon.co.jpSigned-off-by: Jakub Kicinski <kuba@kernel.org>