directsoundsink: Do not overwrite the DS buffer when testing for AC3 support
directsoundsink: Do not overwrite the DS buffer when testing for AC3 support

https://bugzilla.gnome.org/show_bug.cgi?id=680706

knuesel/gst-plugins-good,knuesel/gst-plugins-good,knuesel/gst-plugins-good,knuesel/gst-plugins-good