[PULL 14/15] block-backend: fix blk_co_flush prototype to mention coroutine_fn

[Eric Blake]

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

We already have this marker for the blk_co_flush function declaration in
block/block-backend.c. Add it in the header too.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20211007175243.642516-1-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: wording tweak]
Signed-off-by: Eric Blake <eblake@redhat.com>
---
 include/sysemu/block-backend.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index b5409a6b4553..3fbc74e17cb4 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -183,7 +183,7 @@ BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long 
int req, void *buf,
                           BlockCompletionFunc *cb, void *opaque);
 int coroutine_fn blk_co_pdiscard(BlockBackend *blk, int64_t offset,
                                  int64_t bytes);
-int blk_co_flush(BlockBackend *blk);
+int coroutine_fn blk_co_flush(BlockBackend *blk);
 int blk_flush(BlockBackend *blk);
 int blk_commit_all(void);
 void blk_inc_in_flight(BlockBackend *blk);
-- 
2.31.1