log: Remove unnecessary timing logs for Callbacks bench

Logging of Callbacks are no longer needed and records events that are not relevant for performance analysis.

Author: dougEfresh

src/validation.cpp

@@ -1568,7 +1568,6 @@ static int64_t nTimeForks = 0;
 static int64_t nTimeVerify = 0;
 static int64_t nTimeConnect = 0;
 static int64_t nTimeIndex = 0;
-static int64_t nTimeCallbacks = 0;
 static int64_t nTimeTotal = 0;
 static int64_t nBlocksTotal = 0;
 
@@ -1873,9 +1872,6 @@ bool CChainState::ConnectBlock(const CBlock& block, BlockValidationState& state,
     int64_t nTime5 = GetTimeMicros(); nTimeIndex += nTime5 - nTime4;
     LogPrint(BCLog::BENCH, "    - Index writing: %.2fms [%.2fs (%.2fms/blk)]\n", MILLI * (nTime5 - nTime4), nTimeIndex * MICRO, nTimeIndex * MILLI / nBlocksTotal);
 
-    int64_t nTime6 = GetTimeMicros(); nTimeCallbacks += nTime6 - nTime5;
-    LogPrint(BCLog::BENCH, "    - Callbacks: %.2fms [%.2fs (%.2fms/blk)]\n", MILLI * (nTime6 - nTime5), nTimeCallbacks * MICRO, nTimeCallbacks * MILLI / nBlocksTotal);
-
     TRACE7(validation, block_connected,
         block.GetHash().ToString().c_str(),
         pindex->nHeight,