Add return in check

modules/exploits/osx/local/sudo_password_bypass.rb

@@ -115,7 +115,7 @@ class Metasploit3 < Msf::Exploit::Local
 
     if not user_in_admin_group?
       print_error "sudo version is vulnerable, but user is not in the admin group (necessary to change the date)."
-      Exploit::CheckCode::Safe
+      return Exploit::CheckCode::Safe
     end
     # one root for you sir
     Exploit::CheckCode::Vulnerable