locking/Documentation: Fix a typo of example result

An example result for data dependent write has a typo.  This commit
fixes the wrong typo.
Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dhowells@redhat.com
Cc: linux-arch@vger.kernel.org
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/1470939463-31950-3-git-send-email-paulmck@linux.vnet.ibm.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

Documentation/memory-barriers.txt

@@ -609,7 +609,7 @@ A data-dependency barrier must also order against dependent writes:
 The data-dependency barrier must order the read into Q with the store
 into *Q.  This prohibits this outcome:
 
-	(Q == B) && (B == 4)
+	(Q == &B) && (B == 4)
 
 Please note that this pattern should be rare.  After all, the whole point
 of dependency ordering is to -prevent- writes to the data structure, along