Add missing lock in CNode::copyStats(...)

src/net.cpp

@@ -715,7 +715,10 @@ void CNode::copyStats(CNodeStats &stats)
         X(nRecvBytes);
     }
     X(fWhitelisted);
+    {
+        LOCK(cs_feeFilter);
         X(minFeeFilter);
+    }
 
     // It is common for nodes with good ping times to suddenly become lagged,
     // due to a new block arriving or other large transfer.