rpc: Reduce cs_main lock in listunspent

Author: promag

src/wallet/rpcwallet.cpp

@@ -3149,9 +3149,13 @@ UniValue listunspent(const JSONRPCRequest& request)
 
     UniValue results(UniValue::VARR);
     std::vector<COutput> vecOutputs;
-    LOCK2(cs_main, pwallet->cs_wallet);
+    {
+        LOCK2(cs_main, pwallet->cs_wallet);
+        pwallet->AvailableCoins(vecOutputs, !include_unsafe, nullptr, nMinimumAmount, nMaximumAmount, nMinimumSumAmount, nMaximumCount, nMinDepth, nMaxDepth);
+    }
+
+    LOCK(pwallet->cs_wallet);
 
-    pwallet->AvailableCoins(vecOutputs, !include_unsafe, nullptr, nMinimumAmount, nMaximumAmount, nMinimumSumAmount, nMaximumCount, nMinDepth, nMaxDepth);
     for (const COutput& out : vecOutputs) {
         CTxDestination address;
         const CScript& scriptPubKey = out.tx->tx->vout[out.i].scriptPubKey;