Refactor Code-Example with Better Formatting

No-need to calculate the GetMedianTimePast() value twice.

bip-0148.mediawiki

@@ -38,13 +38,14 @@ While this BIP is active, all blocks must set the nVersion header top 3 bits to
 
 <pre>
 // BIP148 mandatory segwit signalling.
-if (pindex->GetMedianTimePast() >= 1501545600 && // Tue 1 Aug 2017 00:00:00 UTC
-    pindex->GetMedianTimePast() <= 1510704000 && // Wed 15 Nov 2017 00:00:00 UTC
-    !IsWitnessEnabled(pindex->pprev, chainparams.GetConsensus()))
+int64_t nMedianTimePast = pindex->GetMedianTimePast();
+if ( (nMedianTimePast >= 1501545600) &&  // Tue 01 Aug 2017 00:00:00 UTC
+     (nMedianTimePast <= 1510704000) &&  // Wed 15 Nov 2017 00:00:00 UTC
+     (!IsWitnessEnabled(pindex->pprev, chainparams.GetConsensus())) )  // Segwit is not active
 {
-    // versionbits topbit and segwit flag must be set.
-    if ((pindex->nVersion & VERSIONBITS_TOP_MASK) != VERSIONBITS_TOP_BITS ||
-        (pindex->nVersion & VersionBitsMask(chainparams.GetConsensus(), Consensus::DEPLOYMENT_SEGWIT)) == 0) {
+    bool fVersionBits = (pindex->nVersion & VERSIONBITS_TOP_MASK) == VERSIONBITS_TOP_BITS; // BIP9 bit set
+    bool fSegbit = (pindex->nVersion & VersionBitsMask(chainparams.GetConsensus(), Consensus::DEPLOYMENT_SEGWIT)) != 0; // segwit bit set
+    if (!(fVersionBits && fSegbit)) {
         return state.DoS(0, error("ConnectBlock(): relayed block must signal for segwit, please upgrade"), REJECT_INVALID, "bad-no-segwit");
     }
 }