six locks: Delete redundant comment

static void do_six_unlock_type(struct six_lock *lock, enum six_lock_type type);

/*

 * bits 0-26		reader count

 * bits 26-27		write_locking (a thread is trying to get a write lock,

 *			but does not have one yet)

 * bits 27-28		held for intent

 * bits 28-29		nospin - optimistic spinning has timed out

 * bits 29-30		has read waiters

 * bits 30-31		has intent waiters

 * bits 31-32		has write waiters

 */

#define SIX_LOCK_HELD_read_OFFSET	0

#define SIX_LOCK_HELD_read		~(~0U << 26)

#define SIX_LOCK_HELD_intent		(1U << 26)