message: test: Remove new_tx reference
  new_tx is a reference to tx. To avoid confusion and code-bloat, remove it
diff: @@ -47,13 +47,11 @@ def cltv_modify_tx(node, tx, prepend_scriptsig, nsequence=None, nlocktime=None):
  # Need to re-sign, since nSequence and nLockTime changed
  signed_result = node.signrawtransactionwithwallet(ToHex(tx))
  - new_tx = CTransaction()
  - new_tx.deserialize(BytesIO(hex_str_to_bytes(signed_result['hex'])))
  - else:
  - new_tx = tx
  + tx = CTransaction()
  + tx.deserialize(BytesIO(hex_str_to_bytes(signed_result['hex'])))
  - new_tx.vin[0].scriptSig = CScript(prepend_scriptsig + list(CScript(new_tx.vin[0].scriptSig)))
  - return new_tx
  + tx.vin[0].scriptSig = CScript(prepend_scriptsig + list(CScript(tx.vin[0].scriptSig)))
  + return tx
  def cltv_invalidate(node, tx, failure_reason):
  