fixup! txscript: add new RawTxInTapscriptSignature to generate tapsri…

…pt sigs

txscript/sign.go

@@ -134,8 +134,8 @@ func TaprootWitnessSignature(tx *wire.MsgTx, sigHashes *TxSigHashes, idx int,
 // TODO(roasbeef): actually add code-sep to interface? not really used
 // anywhere....
 func RawTxInTapscriptSignature(tx *wire.MsgTx, sigHashes *TxSigHashes, idx int,
-	amt int64, pkScript []byte, tapLeaf TapLeaf, tapScriptRootHash []byte,
-	hashType SigHashType, key *btcec.PrivateKey) ([]byte, error) {
+	amt int64, pkScript []byte, tapLeaf TapLeaf, hashType SigHashType,
+	key *btcec.PrivateKey) ([]byte, error) {
 
 	// First, we'll start by compute the top-level taproot sighash.
 	tapLeafHash := tapLeaf.TapHash()
@@ -148,10 +148,6 @@ func RawTxInTapscriptSignature(tx *wire.MsgTx, sigHashes *TxSigHashes, idx int,
 		return nil, err
 	}
 
-	// Before we sign the sighash, we'll need to apply the taptweak to the
-	// private key based on the tapScriptRootHash.
-	privKeyTweak := TweakTaprootPrivKey(key, tapScriptRootHash)
-
 	// With the sighash constructed, we can sign it with the specified
 	// private key.
 	signature, err := schnorr.Sign(privKeyTweak, sigHash)