Finishes an asynchronous pixbuf save operation started with gdk_pixbuf_save_to_stream_async().
a #GAsyncResult
%TRUE if the pixbuf was saved successfully, %FALSE if an error was set.
GException on failure.
2.24
See Implementation
Finishes an asynchronous pixbuf save operation started with gdk_pixbuf_save_to_stream_async().