aio: fix some comments

The function comments of aio_run_iocb and aio_read_events are out of date, so
fix them here.
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>

fs/aio.c

@@ -1020,7 +1020,7 @@ void aio_complete(struct kiocb *iocb, long res, long res2)
 }
 EXPORT_SYMBOL(aio_complete);
 
-/* aio_read_events
+/* aio_read_events_ring
  *	Pull an event off of the ioctx's event ring.  Returns the number of
  *	events fetched
  */
@@ -1272,9 +1272,8 @@ static ssize_t aio_setup_single_vector(struct kiocb *kiocb,
 }
 
 /*
- * aio_setup_iocb:
- *	Performs the initial checks and aio retry method
- *	setup for the kiocb at the time of io submission.
+ * aio_run_iocb:
+ *	Performs the initial checks and io submission.
  */
 static ssize_t aio_run_iocb(struct kiocb *req, unsigned opcode,
 			    char __user *buf, bool compat)