* scd/iso7816.c (do_generate_keypair): Use const char * for DATA.
(iso7816_generate_keypair, iso7816_read_public_key): Likewise.
* scd/app-openpgp.c (get_public_key): Follow the change.
(do_genkey): Ditto. Use ERR instead of RC. Use u32 for CREATED_AT.
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Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>