bug 2338 fixed: force purge on sessions table (each time a user gets connected)

git-svn-id: http://piwigo.org/svn/branches/2.2@11736 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_user.inc.php

@@ -1102,6 +1102,9 @@ function auto_login() {
  */
 function try_log_user($username, $password, $remember_me)
 {
+  // we force the session table to be clean
+  pwg_session_gc();
+  
   global $conf;
   // retrieving the encrypted password of the login submitted
   $query = '