six locks: Centralize setting of waiting bit

six locks: Centralize setting of waiting bit

Originally, the waiting bit was always set by trylock() on failure:
however, it's now set by __six_lock_type_slowpath(), with wait_lock held
- which is the more correct place to do it.

That made setting the waiting bit in trylock redundant, so this patch
deletes that.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>