mxf2raw: don't ignore group/sequence finalize failures
mxf2raw: don't ignore group/sequence finalize failures

stuarthicks/bmx,kierank/bmxlib-bmx,xunchangguo/BMX,stuarthicks/bmx,ebu/ebu-bmx,kierank/bmxlib-bmx,xunchangguo/BMX,stuarthicks/bmx,Limecraft/ebu-bmx,Limecraft/ebu-bmx,ebu/ebu-bmx,kierank/bmxlib-bmx,Limecraft/ebu-bmx,xunchangguo/BMX,ebu/ebu-bmx