[PULL 3/8] 9pfs: simplify blksize_to_iounit()

[Christian Schoenebeck]

Use QEMU_ALIGN_DOWN() macro to reduce code and to make it
more human readable.

Suggested-by: Philippe Mathieu-Daudé <phi...@redhat.com>
Signed-off-by: Christian Schoenebeck <qemu_...@crudebyte.com>
Reviewed-by: Greg Kurz <gr...@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com>
Message-Id: 
<b84eb324d2ebdcc6f9c442c97b5b4d01eecb4f43.1632758315.git.qemu_...@crudebyte.com>
---
 hw/9pfs/9p.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 5c57344667..e874899ef5 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -1280,8 +1280,7 @@ static int32_t blksize_to_iounit(const V9fsPDU *pdu, 
int32_t blksize)
      * as well as less than (client msize - P9_IOHDRSZ)
      */
     if (blksize) {
-        iounit = blksize;
-        iounit *= (s->msize - P9_IOHDRSZ) / blksize;
+        iounit = QEMU_ALIGN_DOWN(s->msize - P9_IOHDRSZ, blksize);
     }
     if (!iounit) {
         iounit = s->msize - P9_IOHDRSZ;
-- 
2.20.1