src/pki_crypto.c pki_publickey_to_blob() should not be used to export public key from private keys for ecdsa keys. ssh_userauth_publickey() calls ssh_pki_export_pubkey_blob() and tries to export the the public key from private key if public keys are not already imported into pkcs #11 tokens.

Signed-off-by: Sahana Prasad <sahana@redhat.com>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>