add missing return statement to error branch
add missing return statement to error branch

mtlynch/Sia,ChrisSchinnerl/Sia,NebulousLabs/Sia,mharkus/Sia,MrStrong/Sia,mtlynch/Sia,NebulousLabs/Sia,mharkus/Sia,ericflo/Sia,mnsl/Sia,mnsl/Sia,ChrisSchinnerl/Sia,MrStrong/Sia,ericflo/Sia