index: check muhash is in sync on coinstatsindex launch

Author: fjahr

src/index/coinstatsindex.cpp

@@ -363,6 +363,14 @@ bool CoinStatsIndex::Init()
             return error("%s: Cannot read current %s state; index may be corrupted",
                          __func__, GetName());
         }
+
+        uint256 out;
+        m_muhash.Finalize(out);
+        if (entry.muhash != out) {
+            return error("%s: Cannot read current %s state; index may be corrupted",
+                         __func__, GetName());
+        }
+
         m_transaction_output_count = entry.transaction_output_count;
         m_bogo_size = entry.bogo_size;
         m_total_amount = entry.total_amount;