Use static max length

modules/exploits/linux/http/efw_chpasswd_exec.rb

@@ -99,7 +99,6 @@ class Metasploit4 < Msf::Exploit::Remote
         'Valid proxy account username for the target system']),
       OptString.new('EFW_PASSWORD', [true,
         'Valid password for the proxy user account']),
-      OptInt.new('CMD_MAX_LENGTH', [true, 'CMD max line length', 200]),
       OptString.new('RPATH', [true,
         'Target PATH for binaries used by the CmdStager', '/bin'])
      ], self.class)
@@ -120,8 +119,7 @@ class Metasploit4 < Msf::Exploit::Remote
         "please select a native payload")
     end
 
-    execute_cmdstager(:linemax => datastore['CMD_MAX_LENGTH'],
-      :nodelete => true)
+    execute_cmdstager(:linemax => 200, :nodelete => true)
   end
 
   def execute_command(cmd, opts)