decode.c: remove unused assignment
decode.c: remove unused assignment

They're all overriden in the loop following.

jmvalin/daala,luctrudeau/daala,xiph/daala,HeadhunterXamd/daala,KyleSiefring/daala,KyleSiefring/daala,xiphmont/daala,KyleSiefring/daala,xiphmont/daala,xiphmont/daala,xiphmont/daala,HeadhunterXamd/daala,luctrudeau/daala,xiph/daala,jmvalin/daala,jmvalin/daala,luctrudeau/daala,ycho/daala,ycho/daala,jmvalin/daala,xiph/daala,luctrudeau/daala,ycho/daala,HeadhunterXamd/daala,xiph/daala,xiphmont/daala,jmvalin/daala,ycho/daala,luctrudeau/daala,HeadhunterXamd/daala,ycho/daala,KyleSiefring/daala,KyleSiefring/daala,HeadhunterXamd/daala,xiph/daala