Cleanup, initialize stake for chainPower in pre-sapling path

src/miner.cpp

@@ -824,6 +824,7 @@ int32_t waitForPeers(const CChainParams &chainparams)
     {
         bool fvNodesEmpty;
         {
+            boost::this_thread::interruption_point();
             LOCK(cs_vNodes);
             fvNodesEmpty = vNodes.empty();
         }
@@ -833,6 +834,7 @@ int32_t waitForPeers(const CChainParams &chainparams)
                 if (fvNodesEmpty)
                     MilliSleep(1000 + rand() % 4000);
                 {
+                    boost::this_thread::interruption_point();
                     LOCK(cs_vNodes);
                     fvNodesEmpty = vNodes.empty();
                 }

src/pow.cpp

@@ -447,7 +447,7 @@ bool CheckProofOfWork(const CBlockHeader &blkHeader, uint8_t *pubkey33, int32_t
 
 CChainPower GetBlockProof(const CBlockIndex& block)
 {
-    arith_uint256 bnWorkTarget, bnStakeTarget = arith_uint256();
+    arith_uint256 bnWorkTarget, bnStakeTarget = arith_uint256(0);
 
     bool fNegative;
     bool fOverflow;