* agent/findkey.c (agent_write_private_key): Factor file name
generation out to ...
(fname_from_keygrip): new.
(write_extended_private_key): Add and implement new arg MAYBE_UPDATE.
(agent_write_shadow_key): Ditto.
* agent/command.c (cmd_readkey): Update the shadow-key in card mode.
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GnuPG-bug-id 6135