Clean up a bundle of codingstyle stuff in apps directory

Mostly braces and NULL pointer check and also copyright year bump

Signed-off-by: Paul Yang <paulyang.inf@gmail.com>

Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3657)