Change logic

I just can't deal with this "unless" syntax...

modules/exploits/linux/misc/jenkins_java_deserialize.rb

@@ -63,7 +63,7 @@ class Metasploit3 < Msf::Exploit::Remote
   end
 
   def exploit
-    unless cli_port || vulnerable?
+    if cli_port == 0 && !vulnerable?
       fail_with(Failure::Unknown, "#{peer} - Jenkins is not vulnerable, aborting...")
     end
     invoke_remote_method(set_payload)