Bug 29915: (QA follow-up) Add a comment in checkauth on $flags

This is quite a misleading call.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>

C4/Auth.pm

@@ -883,6 +883,7 @@ sub checkauth {
     }
     elsif ( $sessionID = $query->cookie("CGISESSID") ) {    # assignment, not comparison
         my ( $return, $more_info );
+        # NOTE: $flags in the following call is still undefined !
         ( $return, $session, $more_info ) = check_cookie_auth( $sessionID, $flags,
             { remote_addr => $ENV{REMOTE_ADDR}, skip_version_check => 1 }
         );