Update JWT.php

src/JWT.php

@@ -251,7 +251,7 @@
  return \hash_hmac($algorithm, $msg, $key, true);
  case 'openssl':
  $signature = '';
- if (\is_resource($key) && !openssl_pkey_get_private($key)) {
+ if (!\is_resource($key) && !openssl_pkey_get_private($key)) {
  throw new DomainException('OpenSSL unable to validate key');
  }
  $success = \openssl_sign($msg, $signature, $key, $algorithm); // @phpstan-ignore-line