autobuild[sn-devel-144]: intermittent test failure detected

The autobuild test system (on sn-devel-144) has detected an intermittent failing test in 
the current master tree.

The autobuild log of the failure is available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-01-15-1021/flakey.log

The samba build logs are available here:

   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-01-15-1021/samba.stderr
   http://git.samba.org/autobuild.flakey.sn-devel-144/2017-01-15-1021/samba.stdout
  
The top commit at the time of the failure was:

commit e1874bbf26eaa162cd6a5f11d96c564a983c9893
Author: Jeremy Allison <[email protected]>
Date:   Wed Jan 11 11:52:44 2017 -0800

    winbind: Fix CID 1398534 Dereference before null check
    
    Make all query_user_list backends consistent.
    
    Signed-off-by: Jeremy Allison <[email protected]>
    Reviewed-by: Andreas Schneider <[email protected]>
    
    Autobuild-User(master): Andreas Schneider <[email protected]>
    Autobuild-Date(master): Fri Jan 13 13:33:37 CET 2017 on sn-devel-144