rpc: reset scantxoutset progress on finish

Author: prusnak

src/rpc/blockchain.cpp

@@ -2021,13 +2021,15 @@ class CoinsViewScanReserver
         if (g_scan_in_progress.exchange(true)) {
             return false;
         }
+        CHECK_NONFATAL(g_scan_progress == 0);
         m_could_reserve = true;
         return true;
     }
 
     ~CoinsViewScanReserver() {
         if (m_could_reserve) {
             g_scan_in_progress = false;
+            g_scan_progress = 0;
         }
     }
 };
@@ -2140,7 +2142,6 @@ UniValue scantxoutset(const JSONRPCRequest& request)
         std::vector<CTxOut> input_txos;
         std::map<COutPoint, Coin> coins;
         g_should_abort_scan = false;
-        g_scan_progress = 0;
         int64_t count = 0;
         std::unique_ptr<CCoinsViewCursor> pcursor;
         CBlockIndex* tip;