ecc: fix memory leak.
* cipher/ecc.c (ecc_verify): Release memory which was allocated before by _gcry_pk_util_preparse_sigval. (ecc_decrypt_raw): Likewise.
Caught by LeakSanitizer (LSan). Now the test suite (make check) passes
with no memleaks.
The last commit (0a7547e487a8bc4e7ac9599c55579eb2e4a13f06) includes
wrong fixes for sexp_release.
ecc_decrypt_raw fix added by gniibe.
- Signed-off-by: Peter Wu <peter@lekensteyn.nl>