Fix incorrect return code on ECDSA key verification
ECDSA_do_verify() is a function that verifies a ECDSA signature given a hash and a public EC key. The function is supposed to return 1 on valid signature, 0 on invalid signature and -1 on error. Previously, we returned 0 if the key did not have a verify_sig method. This is actually an error case and not an invalid signature. Consequently, this patch updates the return code to -1. Fixes #8766 Reviewed-by: NNicola Tuveri <nic.tuv@gmail.com> Reviewed-by: NMatt Caswell <matt@openssl.org> Reviewed-by: NMatthias St. Pierre <Matthias.St.Pierre@ncp-e.com> (Merged from https://github.com/openssl/openssl/pull/10693)
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