futex: Fix barrier comment
The current comment for the barrier that guarantees that waiter increment is always before taking the hb spinlock (barrier (A)) needs to be fixed as it is misplaced. This is obviously referring to hb_waiters_inc, which is a full barrier. Reported-by: NPeter Zijlstra <peterz@infradead.org> Signed-off-by: NDavidlohr Bueso <dbueso@suse.de> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190206185602.949-1-dave@stgolabs.net
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