tools: gpgconf: Killing order is children-first.
* tools/gpgconf-comp.c (gc_component_kill): Reverse the order.
Cherry-picked from master commit:
The order matters in a corner case; On a busy machine, there was a
race condition between gpg-agent's running KILLAGENT command and its
accepting incoming request on the socket. If a request by
gpg-connect-agent was accepted, it resulted an error by sudden
shutdown. This change of the order can remove such a race.
Here, we know backend=0 is none.
- GnuPG-bug-id: T4577
- Signed-off-by: NIIBE Yutaka <firstname.lastname@example.org>