Call FlushStateToDisk(...) regardless of fCheckForPruning

FlushStateToDisk(...) won't do anything besides check if we need to prune if
FLUSH_STATE_NONE is given. We avoid reading the variable fCheckForPruning
which is guarded by the mutex cs_LastBlockFile.

src/validation.cpp

@@ -3454,8 +3454,7 @@ bool CChainState::AcceptBlock(const std::shared_ptr<const CBlock>& pblock, CVali
         return AbortNode(state, std::string("System error: ") + e.what());
     }
 
-    if (fCheckForPruning)
-        FlushStateToDisk(chainparams, state, FlushStateMode::NONE); // we just allocated more disk space for block files
+    FlushStateToDisk(chainparams, state, FlushStateMode::NONE);
 
     CheckBlockIndex(chainparams.GetConsensus());