test secp256k1_ecdsa_sign when parameter parsing fails
test secp256k1_ecdsa_sign when parameter parsing fails

Bit-Wasp/secp256k1-php,afk11/secp256k1-php,afk11/secp256k1-php,Bit-Wasp/secp256k1-php,Bit-Wasp/secp256k1-php,afk11/secp256k1-php,Bit-Wasp/secp256k1-php,afk11/secp256k1-php,Bit-Wasp/secp256k1-php,afk11/secp256k1-php