block: remove unnecessary trailing '\'

While harmless, the blank line is certainly not intended to be part of
the rq_list_for_each() macro. Remove it.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20211222215239.1768164-1-kbusch@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

include/linux/blkdev.h

@@ -1363,7 +1363,7 @@ struct io_comp_batch {
 })
 
 #define rq_list_for_each(listptr, pos)			\
-	for (pos = rq_list_peek((listptr)); pos; pos = rq_list_next(pos)) \
+	for (pos = rq_list_peek((listptr)); pos; pos = rq_list_next(pos))
 
 #define rq_list_next(rq)	(rq)->rq_next
 #define rq_list_empty(list)	((list) == (struct request *) NULL)