Apply the cluebat to myself and undo the await() -> mawait() rename. The

asleep() and await() functions split the functionality of msleep() up into
two halves.  Only the asleep() half (which is what puts the process on the
sleep queue) actually needs the lock usually passed to msleep() held to
prevent lost wakeups.  await() does not need the lock held, so the lock
can be released prior to calling await() and does not need to be passed in
to the await() function.  Typical usage of these functions would be as
follows:

        mtx_lock(&foo_mtx);
        ... do stuff ...
        asleep(&foo_cond, PRIxx, "foowt", hz);
        ...
        mtx_unlock&foo_mtx);
        ...
        await(-1, -1);

Inspired by:	dillon on the couch at Usenix

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