Device needs the exact size of these data structure. Prevent padding.

This fixes guest hang when booting seabios + tcm_vhost.

Signed-off-by: Asias He <redacted>
---
 src/virtio-scsi.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/virtio-scsi.h b/src/virtio-scsi.h
index bbfbf30..96c3701 100644
--- a/src/virtio-scsi.h
+++ b/src/virtio-scsi.h

@@ -26,7 +26,7 @@ struct virtio_scsi_req_cmd {
     u8 prio;
     u8 crn;
     char cdb[VIRTIO_SCSI_CDB_SIZE];
-};
+} __attribute__((packed));
 
 /* This is the first element of the "in" scatter-gather list. */
 struct virtio_scsi_resp_cmd {

@@ -36,7 +36,7 @@ struct virtio_scsi_resp_cmd {
     u8 status;
     u8 response;
     u8 sense[VIRTIO_SCSI_SENSE_SIZE];
-};
+} __attribute__((packed));
 
 #define VIRTIO_SCSI_S_OK            0