bcache: closures: move control bits one bit right

Otherwise, architectures that do negated adds of atomics (e.g. s390)
to do atomic_sub fail in closure_set_stopped.

Signed-off-by: Michael Lyle <mlyle@lyle.org>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/md/bcache/closure.h

@@ -127,10 +127,10 @@ enum closure_state {
 	 * annotate where references are being transferred.
 	 */
 
-	CLOSURE_BITS_START	= (1U << 27),
-	CLOSURE_DESTRUCTOR	= (1U << 27),
-	CLOSURE_WAITING		= (1U << 29),
-	CLOSURE_RUNNING		= (1U << 31),
+	CLOSURE_BITS_START	= (1U << 26),
+	CLOSURE_DESTRUCTOR	= (1U << 26),
+	CLOSURE_WAITING		= (1U << 28),
+	CLOSURE_RUNNING		= (1U << 30),
 };
 
 #define CLOSURE_GUARD_MASK					\