It eases code review, unit is explicit.

Patch generated using:

  $ git grep -E '(1024|2048|4096|8192|(<<|>>).?(10|20|30))' hw/ include/hw/

and modified manually.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 hw/misc/ivshmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index 16f03701b7..9b3ad96471 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -1302,7 +1302,7 @@ static void ivshmem_realize(PCIDevice *dev, Error **errp)
     }
 
     if (s->sizearg == NULL) {
-        s->legacy_size = 4 << 20; /* 4 MB default */
+        s->legacy_size = 4 * M_BYTE; /* 4 MB default */
     } else {
         int ret;
         uint64_t size;
-- 
2.16.2