lockdep: Simplify lock_release()

lock_release() takes this nested argument that's mostly pointless
these days, remove the implementation but leave the argument a
rudiment for now.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: ktkhai@parallels.com
Cc: rostedt@goodmis.org
Cc: juri.lelli@gmail.com
Cc: pang.xunlei@linaro.org
Cc: oleg@redhat.com
Cc: wanpeng.li@linux.intel.com
Cc: umgwanakikbuti@gmail.com
Link: http://lkml.kernel.org/r/20150611124743.840411606@infradead.org


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>