Informs a pixbuf loader that no further writes with write will occur, so that it can free its internal loading structures.
This function 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 `GDK_PIXBUF_ERROR` or `G_FILE_ERROR` domains.
If you're just cancelling a load rather than expecting it to be finished, passing `NULL` for `error` to ignore it is reasonable.
Remember that this function does not release a reference on the loader, so you will need to explicitly release any reference you hold.
A pixbuf loader.
`TRUE` if all image data written so far was successfully passed out via the update_area signal