Merge #17449: fix uninitialized variable nMinerConfirmationWindow

edb6b76 fix uninitialized variable nMinerConfirmationWindow (NullFunctor)

Pull request description:

  It is used for the computation of `BIP9WarningHeight`, and by that time it isn't initialized.

ACKs for top commit:
  jnewbery:
    utACK edb6b76
  promag:
    ACK edb6b76, commit description could be cleaned up though.
  MarcoFalke:
    ACK edb6b76, used python3 to do the addition locally 📍
  practicalswift:
    ACK edb6b76, used `clang++ -O2` on the previous version^W^W^W^W^W^W`bc` to verify the addition locally 🏓
  Sjors:
    Code review ACK  edb6b76. Nit: commit description has duplicate text.

Tree-SHA512: 6fa0be0ecfbfd5d537f2c5b4a9333c76530c1f3182f777330cc7939b0496e37b75d8f8810cdaf471a9bd3247b425f2e239578300dfa0d5a87cd14a6ccfafa619

Author: fanquake

src/chainparams.cpp

@@ -71,7 +71,7 @@ class CMainParams : public CChainParams {
         consensus.BIP66Height = 363725; // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
         consensus.CSVHeight = 419328; // 000000000000000004a1b34462cb8aeebd5799177f7a29cf28f2d1961716b5b5
         consensus.SegwitHeight = 481824; // 0000000000000000001c8018d9cb3b742ef25114f27563e3fc4a1902167f9893
-        consensus.MinBIP9WarningHeight = consensus.SegwitHeight + consensus.nMinerConfirmationWindow;
+        consensus.MinBIP9WarningHeight = 483840; // segwit activation height + miner confirmation window
         consensus.powLimit = uint256S("00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
         consensus.nPowTargetSpacing = 10 * 60;
@@ -178,7 +178,7 @@ class CTestNetParams : public CChainParams {
         consensus.BIP66Height = 330776; // 000000002104c8c45e99a8853285a3b592602a3ccde2b832481da85e9e4ba182
         consensus.CSVHeight = 770112; // 00000000025e930139bac5c6c31a403776da130831ab85be56578f3fa75369bb
         consensus.SegwitHeight = 834624; // 00000000002b980fcd729daaa248fd9316a5200e9b367f4ff2c42453e84201ca
-        consensus.MinBIP9WarningHeight = consensus.SegwitHeight + consensus.nMinerConfirmationWindow;
+        consensus.MinBIP9WarningHeight = 836640; // segwit activation height + miner confirmation window
         consensus.powLimit = uint256S("00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
         consensus.nPowTargetSpacing = 10 * 60;