* io-tiff.c (tiff_image_parse): Don't leak pixbuf on error.

	* io-gif.c (gdk_pixbuf__gif_image_load_increment): Don't leak
	context->buf on error.

	* gdk-pixbuf-loader.c (gdk_pixbuf_loader_close): Make sure to call
	stop_load even for short images to prevent memleaks.