Land rapid7#7622, Fix check_conn? method in cisco_ironport_enum

Author: pbarry-r7

modules/auxiliary/scanner/http/cisco_ironport_enum.rb

@@ -60,10 +60,14 @@ def check_conn?
         'uri'       => '/',
         'method'    => 'GET'
       })
-      print_good("#{rhost}:#{rport} - Server is responsive...")
-      return 1
+      if res
+        print_good("#{rhost}:#{rport} - Server is responsive...")
+        return true
+      else
+        return false
+      end
     rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout, ::Rex::ConnectionError, ::Errno::EPIPE
-      return
+      return false
     end
   end