gdkPixbufLoaderWrite
will occur, so that it can free its
internal loading structures. Also, tries to parse any data that
hasn't yet been parsed; if the remaining data is partial or
corrupt, an error will be returned. If FALSE
is returned, error
will be set to an error from the NULL
for error
to ignore it is
reasonable.gdkPixbufLoaderClose(object, .errwarn = TRUE)