Fix manage/pxexploit datastore

Author: wvu

modules/post/windows/manage/pxexploit.rb

@@ -36,7 +36,8 @@ def initialize
 
     register_advanced_options(
       [
-        OptString.new('TFTPROOT',   [ false,  'The TFTP root directory to serve files from' ]),
+        OptString.new('TFTPROOT',   [ false,  'The TFTP root directory to serve files from',
+          File.join(Msf::Config.data_directory, 'exploits', 'pxexploit')]),
         OptString.new('SRVHOST',   [ false,  'The IP of the DHCP server' ]),
         OptString.new('NETMASK',   [ false,  'The netmask of the local subnet', '255.255.255.0' ]),
         OptBool.new('RESETPXE',   [ true,  'Resets the server to re-exploit already targeted hosts', false ]),
@@ -46,9 +47,6 @@ def initialize
   end
 
   def run
-    if not datastore['TFTPROOT']
-      datastore['TFTPROOT'] = ::File.join(Msf::Config.data_directory, 'exploits', 'pxexploit')
-    end
     if not client.lanattacks
       print_status("Loading lanattacks extension...")
       client.core.use("lanattacks")