rtmutex: Simplify rtmutex_slowtrylock()

/*

 * Slow path try-lock function:

 */

static inline int

rt_mutex_slowtrylock(struct rt_mutex *lock)

static inline int rt_mutex_slowtrylock(struct rt_mutex *lock)

{

	int ret = 0;

	int ret;

	raw_spin_lock(&lock->wait_lock);

	/*

	 * If the lock already has an owner we fail to get the lock.

	 * This can be done without taking the @lock->wait_lock as

	 * it is only being read, and this is a trylock anyway.

	 */

	if (rt_mutex_owner(lock))

		return 0;

	if (likely(rt_mutex_owner(lock) != current)) {

	/*

	 * The mutex has currently no owner. Lock the wait lock and

	 * try to acquire the lock.

	 */

	raw_spin_lock(&lock->wait_lock);

	ret = try_to_take_rt_mutex(lock, current, NULL);

	/*

		 * try_to_take_rt_mutex() sets the lock waiters

		 * bit unconditionally. Clean this up.

	 * try_to_take_rt_mutex() sets the lock waiters bit

	 * unconditionally. Clean this up.

	 */

	fixup_rt_mutex_waiters(lock);

	}

	raw_spin_unlock(&lock->wait_lock);