tools: gpgconf: Killing order is children-first.
526714806da4
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tools: gpgconf: Killing order is children-first.

* tools/gpgconf-comp.c (gc_component_kill): Reverse the order.

Cherry-picked from master commit:
7c877f942a344e7778005840ed7f3e20ace12f4a

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.