lockdep: Check if nested lock is actually held

It is considered good form to lock the lock you claim to be nested in.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>

[ removed nest_lock arg to print_lock_nested_lock_not_held in favour
  of hlock->nest_lock, also renamed the lock arg to hlock since its
  a held_lock type ]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/5051A9E7.5040501@canonical.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>