ECDSA verification succeeds when it shouldn't

[NIIBE Yutaka]

Guido Vranken via Gcrypt-devel <gcrypt-devel at gnupg.org> wrote:
> My fuzzer found this:
[...]
> gcry_pk_verify() returns GPG_ERR_NO_ERROR for these parameters but other
> libraries return failure.

Thank you.

For some reason which I don't know, perhaps hisotorically, checking
public key was not done (other than for EdDSA).

I created the task:
    https://dev.gnupg.org/T5282

And push a fix commit:
    https://dev.gnupg.org/rC598d0f3e0294a487e01b88cc714a8cd0a47329bb
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