ecc: Fix handling of point representation in EdDSA.
* cipher/ecc-eddsa.c (_gcry_ecc_eddsa_ensure_compact): Use GCRYMPI_FMT_USG, since integer is defined as unsigned in SEC1. (_gcry_ecc_eddsa_decodepoint): Likewise.
It has been not an issue because it's 2^255 - 19 only (MSB is always
cleared).
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>