txscript: Remove excessive error check.
txscript: Remove excessive error check.

ltcsuite/ltcd,glv2/ppcd,Dirbaio/btcd,tb00/btcd,pkothbauer/btcd,qchain/btcd,toddfries/btcd,jrick/dcrd,davecgh/btcd,cjepson/btcd,CryptocurrencyCabal/htcd,Cleawing/btcd,ppcsuite/ppcd-old,Roasbeef/btcd,jimmysong/btcd,aakselrod/btcd,stevenroose/btcd,davecgh/btcd,Cleawing/btcd,ppcsuite/ppcd,mathiasrw/btcd,jrick/btcd,jimmysong/btcd,runeaune/btcd,jrick/btcd,hectorj/btcd,Dirbaio/btcd,mathiasrw/btcd,cjepson/btcd,BitGo/prova,jcmincke/dcrd,jcmincke/dcrd,dajohi/btcd,ppcsuite/ppcd,btcsuite/btcd,hectorj/btcd,dan-da/btcd,jrick/btcd,tb00/btcd,1d4Nf6/btcd,btcsuitereleases/btcd,Dirbaio/btcd,BitGo/prova,soapboxsys/ombfullnode,jcmincke/dcrd,CryptocurrencyCabal/htcd,dajohi/btcd,aakselrod/btcd,danoctavian/btcd,soapboxsys/ombfullnode,adiabat/btcd,dajohi/btcd,pkothbauer/btcd,dan-da/btcd,wallclockbuilder/btcd,glv2/ppcd,jongillham/btcd,cqswxj2013/btcd,Roasbeef/btcd,ppcsuite/ppcd-old,ltcsuite/ltcd,jrick/dcrd,wallclockbuilder/btcd,adiabat/btcd,decred/dcrd,stevenroose/btcd,Stash-Crypto/btcd,danoctavian/btcd,1d4Nf6/btcd,Stash-Crypto/btcd,decred/dcrd,toddfries/btcd,qchain/btcd,btcsuite/btcd,cqswxj2013/btcd,DanielKrawisz/btcd,runeaune/btcd,DanielKrawisz/btcd,btcsuitereleases/btcd,jongillham/btcd