virtio: remove unused id field from struct virtio_blk_outhdr

This field has been unused since an older version of virtio.  Remove
it now before we freeze the ABI.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au.

diff --git a/include/linux/virtio_blk.h b/include/linux/virtio_blk.h
index e546356..bca0b10 100644 (file)
--- a/include/linux/virtio_blk.h
+++ b/include/linux/virtio_blk.h
@@ -39,8 +39,6 @@ struct virtio_blk_outhdr
        __u32 ioprio;
        /* Sector (ie. 512 byte offset) */
        __u64 sector;
-       /* Where to put reply. */
-       __u64 id;
 };
 
 #define VIRTIO_BLK_S_OK                0