All of the megasas mmio registers are 32-bit not 64-bit.

Cc: qemu-block@nongnu.org
Cc: Fam Zheng <fam@euphon.net>
Cc: Hannes Reinecke <hare@suse.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 hw/scsi/megasas.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 8f2389d2c6..c98cb7a499 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -2163,8 +2163,8 @@ static const MemoryRegionOps megasas_mmio_ops = {
     .write = megasas_mmio_write,
     .endianness = DEVICE_LITTLE_ENDIAN,
     .impl = {
-        .min_access_size = 8,
-        .max_access_size = 8,
+        .min_access_size = 4,
+        .max_access_size = 4,
     }
 };
 
-- 
2.25.1