* scd/app-openpgp.c (do_sign): Clear DID_CHV1 after signing.
--
Cherry-picked from master commit of:
78f542e1f4495195db2e668f9cd41657fb1afc77
We have a corner case: In "not forced" situation and authenticated,
and it is changed to "forced", card implementaiton can actually accept
signing, but GnuPG requires authentication, because it is "forced".
GnuPG-bug-id: 4177
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>