Silence a warning/error from g++ about an uninitialized value.
Silence a warning/error from g++ about an uninitialized value.

Fixes T20.  Clang is smart enough to know that assert(0) will not return, and
thus there is no path that touches the uninitialized value.  g++ is not quite
so savvy, and thus complains.

benjyw/kythe,legrosbuffle/kythe,Acidburn0zzz/kythe,benjyw/kythe,bzz/kythe,bowlofstew/kythe,benjyw/kythe,kidaa/kythe,bowlofstew/kythe,benjyw/kythe,bzz/kythe,legrosbuffle/kythe,benjyw/kythe,kythe/kythe,bzz/kythe,benjyw/kythe,bzz/kythe,legrosbuffle/kythe,legrosbuffle/kythe,bowlofstew/kythe,kidaa/kythe,benjyw/kythe,bzz/kythe,kidaa/kythe,Acidburn0zzz/kythe,kidaa/kythe,benjyw/kythe,legrosbuffle/kythe,benjyw/kythe,kidaa/kythe,bowlofstew/kythe,bowlofstew/kythe,benjyw/kythe,kythe/kythe,Acidburn0zzz/kythe,legrosbuffle/kythe,legrosbuffle/kythe,Acidburn0zzz/kythe,bowlofstew/kythe,bzz/kythe,kythe/kythe,legrosbuffle/kythe,bowlofstew/kythe,bzz/kythe,benjyw/kythe,kythe/kythe,legrosbuffle/kythe,kidaa/kythe,kythe/kythe,legrosbuffle/kythe,kidaa/kythe,legrosbuffle/kythe,bowlofstew/kythe,kythe/kythe,bzz/kythe,Acidburn0zzz/kythe,Acidburn0zzz/kythe,kythe/kythe,benjyw/kythe,bowlofstew/kythe,kidaa/kythe,bowlofstew/kythe,bzz/kythe,Acidburn0zzz/kythe,bowlofstew/kythe,bzz/kythe,bzz/kythe,kythe/kythe,Acidburn0zzz/kythe,Acidburn0zzz/kythe,kythe/kythe,bzz/kythe,kidaa/kythe,kythe/kythe,kythe/kythe