Remove junk() because it's never used

modules/exploits/windows/browser/imgeviewer_tifmergemultifiles.rb

@@ -73,10 +73,6 @@ class Metasploit3 < Msf::Exploit::Remote
 		use_zlib
 	end
 
-	def junk(n=4)
-		return rand_text_alpha(n).unpack("L")[0].to_i
-	end
-
 	def on_request_uri(cli, request)
 
 		# Set target manually or automatically