New system for silent require errors. Use the new function

stdnse.silent_require. The Lua require function is back in its usual spot
(_G.require).

scripts/mysql-brute.nse

@@ -17,7 +17,7 @@ require 'shortport'
 require 'stdnse'
 require 'mysql'
 require 'unpwdb'
-require 'openssl'
+stdnse.silent_require 'openssl'
 
 -- Version 0.3
 -- Created 01/15/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>