Return better error code for some getinfo IPC commands.

Return better error code for some getinfo IPC commands.

* agent/command.c (cmd_getinfo): Return GPG_ERR_FALSE as boolean False.
* g13/server.c (cmd_getinfo): Ditto.
* sm/server.c (cmd_getinfo): Ditto.
--

GPG_ERR_FALSE was introduced with libgpg-error 1.21 and we now require
a later version for gnupg 2.  Thus we can switch to this more
descriptive code.

Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit f3251023750d6bd9023dbb8373c804d7d4540a56)

Gbp-Pq: Topic from-2.2.17
Gbp-Pq: Name Return-better-error-code-for-some-getinfo-IPC-commands.patch