aacparse: fix LOAS parsing issue
aacparse: fix LOAS parsing issue

Fix missing index in syncword searching

https://bugzilla.gnome.org/show_bug.cgi?id=745585

ndufresne/gst-plugins-good,vatavuserban/gst-plugins-good,vatavuserban/gst-plugins-good,ndufresne/gst-plugins-good,ndufresne/gst-plugins-good,vatavuserban/gst-plugins-good,vatavuserban/gst-plugins-good,ndufresne/gst-plugins-good