asfdemux: really copy the buffer data
asfdemux: really copy the buffer data

Pass the copy-memory flag to copy the memory for the output buffer,
otherwise we end with 0-sized buffers

https://bugzilla.gnome.org/show_bug.cgi?id=684942

Lachann/gst-plugins-ugly,GrokImageCompression/gst-plugins-ugly,cablelabs/gst-plugins-ugly,krieger-od/gst-plugins-ugly,freedesktop-unofficial-mirror/gstreamer__gst-plugins-ugly,Kurento/gst-plugins-ugly,krieger-od/gst-plugins-ugly,freedesktop-unofficial-mirror/gstreamer__gst-plugins-ugly,freedesktop-unofficial-mirror/gstreamer__gst-plugins-ugly,reynaldo-samsung/gst-plugins-ugly,surround-io/gst-plugins-ugly,jpakkane/gstreamer-plugins-ugly,Kurento/gst-plugins-ugly,shelsonjava/gst-plugins-ugly,StreamUtils/gst-plugins-ugly,surround-io/gst-plugins-ugly,krieger-od/gst-plugins-ugly,sebras/gst-plugins-ugly,jpakkane/gstreamer-plugins-ugly,sebras/gst-plugins-ugly,shelsonjava/gst-plugins-ugly,Lachann/gst-plugins-ugly,shelsonjava/gst-plugins-ugly,StreamUtils/gst-plugins-ugly,cablelabs/gst-plugins-ugly,GrokImageCompression/gst-plugins-ugly,Lachann/gst-plugins-ugly,surround-io/gst-plugins-ugly,GStreamer/gst-plugins-ugly,reynaldo-samsung/gst-plugins-ugly,sebras/gst-plugins-ugly,reynaldo-samsung/gst-plugins-ugly,StreamUtils/gst-plugins-ugly,Kurento/gst-plugins-ugly,GStreamer/gst-plugins-ugly,cablelabs/gst-plugins-ugly,GrokImageCompression/gst-plugins-ugly,GStreamer/gst-plugins-ugly,jpakkane/gstreamer-plugins-ugly,krieger-od/gst-plugins-ugly