gboolean success;
g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
- g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (stream), FALSE);
+ g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
g_return_val_if_fail (format != NULL, FALSE);