UPSTREAM: rtmutex: Remove unused argument from rt_mutex_proxy_unlock()

commit 2156ac1934166d6deb6cd0f6ffc4c1076ec63697 upstream

Nothing uses the argument. Remove it as preparation to use
pi_state_update_owner().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 2156ac1934166d6deb6cd0f6ffc4c1076ec63697)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I126088d93c5f05db654e508dfd4195e5c1696164