Properly exit the core resource thread.

servo · bors-servo · Nov 24, 2016 · Nov 3, 2016 · Nov 2, 2016 · Nov 2, 2016
commit 15e8f4f0d4ff437aa4ab98a43ee596a747fc0eed
diff --git a/components/net/resource_thread.rs b/components/net/resource_thread.rs
@@ -241,7 +241,7 @@ impl ResourceChannelManager {
                 };
                 if let Ok(msg) = data.to() {
                     if !self.process_msg(msg, group, &sender) {
-                        break;
+                        return;
                     }
                 }
             }