validation: Make VerifyDB level 4 interruptible

Author: MarcoFalke

src/validation.cpp

@@ -4313,8 +4313,7 @@ bool CVerifyDB::VerifyDB(const CChainParams& chainparams, CCoinsView *coinsview,
                 nGoodTransactions += block.vtx.size();
             }
         }
-        if (ShutdownRequested())
-            return true;
+        if (ShutdownRequested()) return true;
     }
     if (pindexFailure)
         return error("VerifyDB(): *** coin database inconsistencies found (last %i blocks, %i good transactions before that)\n", ::ChainActive().Height() - pindexFailure->nHeight + 1, nGoodTransactions);
@@ -4338,6 +4337,7 @@ bool CVerifyDB::VerifyDB(const CChainParams& chainparams, CCoinsView *coinsview,
                 return error("VerifyDB(): *** ReadBlockFromDisk failed at %d, hash=%s", pindex->nHeight, pindex->GetBlockHash().ToString());
             if (!::ChainstateActive().ConnectBlock(block, state, pindex, coins, chainparams))
                 return error("VerifyDB(): *** found unconnectable block at %d, hash=%s (%s)", pindex->nHeight, pindex->GetBlockHash().ToString(), state.ToString());
+            if (ShutdownRequested()) return true;
         }
     }