Fix unlocked access to vNodes.size()

src/net.cpp

@@ -1042,8 +1042,13 @@ void ThreadSocketHandler()
                 }
             }
         }
-        if(vNodes.size() != nPrevNodeCount) {
-            nPrevNodeCount = vNodes.size();
+        size_t vNodesSize;
+        {
+            LOCK(cs_vNodes);
+            vNodesSize = vNodes.size();
+        }
+        if (vNodesSize != nPrevNodeCount) {
+            nPrevNodeCount = vNodesSize;
             uiInterface.NotifyNumConnectionsChanged(nPrevNodeCount);
         }