multi: use prev output fetcher in sign desc

cmd/chantools/sweepremoteclosed.go

@@ -227,6 +227,7 @@ func sweepRemoteClosed(extendedKey *hdkeychain.ExtendedKey, apiURL,
 				WitnessScript:     target.script,
 				Output:            prevTxOut,
 				HashType:          txscript.SigHashAll,
+				PrevOutputFetcher: prevOutFetcher,
 			})
 		}
 	}

cmd/chantools/sweeptimelock.go

@@ -274,6 +274,7 @@ func sweepTimeLock(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 			WitnessScript:     script,
 			Output:            prevTxOut,
 			HashType:          txscript.SigHashAll,
+			PrevOutputFetcher: prevOutFetcher,
 		}
 		totalOutputValue += target.value
 		signDescs = append(signDescs, signDesc)

cmd/chantools/sweeptimelockmanual.go

@@ -273,6 +273,7 @@ func sweepTimeLockManual(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 		},
 		InputIndex:        0,
 		SigHashes:         sigHashes,
+		PrevOutputFetcher: prevOutFetcher,
 		HashType:          txscript.SigHashAll,
 	}
 	witness, err := input.CommitSpendTimeout(signer, signDesc, sweepTx)

lnd/signer.go

@@ -140,6 +140,7 @@ func (s *Signer) AddPartialSignature(packet *psbt.Packet,
 		Output:            utxo,
 		InputIndex:        inputIndex,
 		HashType:          txscript.SigHashAll,
+		PrevOutputFetcher: prevOutFetcher,
 		SigHashes: txscript.NewTxSigHashes(
 			packet.UnsignedTx, prevOutFetcher,
 		),