xform: fix Clang can't deduce return type of recursive varidic function
xform: fix Clang can't deduce return type of recursive varidic function

Poor thing.

respu/atria,dodheim/atria,dodheim/atria,lyrl/atria,respu/atria,lyrl/atria,bowlofstew/atria,manashmndl/atria,lyrl/atria,shaunstanislaus/atria,kod3r/atria,respu/atria,dodheim/atria,shaunstanislaus/atria,Ableton/atria,iankronquist/atria,shaunstanislaus/atria,AbletonAG/atria,iankronquist/atria,AbletonAG/atria,Ableton/atria,manashmndl/atria,manashmndl/atria,Ableton/atria,kod3r/atria,bowlofstew/atria,bowlofstew/atria,AbletonAG/atria,kod3r/atria,iankronquist/atria