Fix failure messages for check().

Author: nnam

modules/exploits/windows/ftp/wing_ftp_server_rce.rb

@@ -56,9 +56,9 @@ def check
       })
 
     if !res
-      fail_with(Failure::Unreachable, "#{peer} - Vulnerable page was unreachable.")
+      fail_with(Failure::Unreachable, "#{peer} - Admin login page was unreachable.")
     elsif res.code != 200 
-      fail_with(Failure::UnexpectedReply, "#{peer} - Unexpected HTTP Response Code.")
+      fail_with(Failure::NotFound, "#{peer} - Admin login page was not found.")
     elsif res.body =~ /Wing FTP Server Administrator/ and res.body =~ /2003-2014 <b>wftpserver.com<\/b>/
       return Exploit::CheckCode::Appears
     end