dm: Simplify dm_io_complete()

The local variable first_requeue is not needed since it is always equal
to dm_io_flagged(io, DM_IO_WAS_SPLIT). Call __dm_io_complete() passing
this value directly and remove first_requeue.

Also declare dm_io_complete() as inline to make sure it is inlined in
its single call site, thus avoiding the cost of a function call.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Author: damien-lemoal

drivers/md/dm.c

@@ -1024,10 +1024,8 @@ static void dm_wq_requeue_work(struct work_struct *work)
  *
  * 2) io->orig_bio points to new cloned bio which matches the requeued dm_io.
  */
-static void dm_io_complete(struct dm_io *io)
+static inline void dm_io_complete(struct dm_io *io)
 {
-	bool first_requeue;
-
 	/*
 	 * Only dm_io that has been split needs two stage requeue, otherwise
 	 * we may run into long bio clone chain during suspend and OOM could
@@ -1036,12 +1034,7 @@ static void dm_io_complete(struct dm_io *io)
 	 * Also flush data dm_io won't be marked as DM_IO_WAS_SPLIT, so they
 	 * also aren't handled via the first stage requeue.
 	 */
-	if (dm_io_flagged(io, DM_IO_WAS_SPLIT))
-		first_requeue = true;
-	else
-		first_requeue = false;
-
-	__dm_io_complete(io, first_requeue);
+	__dm_io_complete(io, dm_io_flagged(io, DM_IO_WAS_SPLIT));
 }
 
 /*