Remove more implicit fallthrough compiler warnings

src/hash.cpp

@@ -49,8 +49,10 @@ unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char
         switch (vDataToHash.size() & 3) {
         case 3:
             k1 ^= tail[2] << 16;
+            // Falls through
         case 2:
             k1 ^= tail[1] << 8;
+            // Falls through
         case 1:
             k1 ^= tail[0];
             k1 *= c1;

src/qt/rpcconsole.cpp

@@ -268,7 +268,9 @@ bool RPCConsole::RPCParseCommandLine(std::string &strResult, const std::string &
                 }
                 if (breakParsing)
                     break;
+
             }
+            // Falls through
             case STATE_ARGUMENT: // In or after argument
             case STATE_EATING_SPACES_IN_ARG:
             case STATE_EATING_SPACES_IN_BRACKETS:
@@ -374,6 +376,7 @@ bool RPCConsole::RPCParseCommandLine(std::string &strResult, const std::string &
                 strResult = lastResult.get_str();
             else
                 strResult = lastResult.write(2);
+            // Falls through
         case STATE_ARGUMENT:
         case STATE_EATING_SPACES:
             return true;

src/rest.cpp

@@ -461,6 +461,7 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
         std::vector<unsigned char> strRequestV = ParseHex(strRequestMutable);
         strRequestMutable.assign(strRequestV.begin(), strRequestV.end());
     }
+    // Falls through
 
     case RF_BINARY: {
         try {

src/rpc/mining.cpp

@@ -666,9 +666,11 @@ UniValue getblocktemplate(const JSONRPCRequest& request)
                 // Not exposed to GBT at all
                 break;
             case THRESHOLD_LOCKED_IN:
-                // Ensure bit is set in block version
+            {
+                // Ensure bit is set in block version, then fall through to get vbavailable set
                 pblock->nVersion |= VersionBitsMask(consensusParams, pos);
-                // FALL THROUGH to get vbavailable set...
+            }
+            // Falls through
             case THRESHOLD_STARTED:
             {
                 const struct BIP9DeploymentInfo& vbinfo = VersionBitsDeploymentInfo[pos];