Bugfix use of stack-local crypto handle in symmetric.decrypt()

src/vmod_gcrypt.c

@@ -466,9 +466,8 @@ vmod_symmetric_decrypt(VRT_CTX, struct vmod_gcrypt_symmetric *symmetric,
 			return NULL;
 		}
 	}
-	if ((err = gcry_cipher_decrypt(symmetric->hd, plaintext->priv,
-				       ciphertext->len, ciphertext->priv,
-				       ciphertext->len))
+	if ((err = gcry_cipher_decrypt(hd, plaintext->priv, ciphertext->len,
+				       ciphertext->priv, ciphertext->len))
 	    != GPG_ERR_NO_ERROR) {
 		VERR(ctx, "in %s.decrypt(): %s/%s", symmetric->vcl_name,
 		     gcry_strsource(err), gcry_strerror(err));