cluster: remove unnecessary bind

Author: apapirovski

lib/internal/cluster/child.js

@@ -118,8 +118,8 @@ function shared(message, handle, indexesKey, cb) {
     send({ act: 'close', key });
     handles.delete(key);
     indexes.delete(indexesKey);
-    return close.apply(this, arguments);
-  }.bind(handle);
+    return close.apply(handle, arguments);
+  };
   assert(handles.has(key) === false);
   handles.set(key, handle);
   cb(message.errno, handle);