net: change assert to conform to other files

PR-URL: #15861
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

lib/net.js

@@ -817,7 +817,7 @@ function connect(self, address, port, addressType, localAddress, localPort) {
   // TODO return promise from Socket.prototype.connect which
   // wraps _connectReq.
 
-  assert.ok(self.connecting);
+  assert(self.connecting);
 
   var err;
 
@@ -1065,7 +1065,7 @@ function afterConnect(status, handle, req, readable, writable) {
 
   debug('afterConnect');
 
-  assert.ok(self.connecting);
+  assert(self.connecting);
   self.connecting = false;
   self._sockname = null;