9pfs: drop root_qid

There is no longer a user of root_qid, so drop it.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <6896dd161d3257db6b0513842a14f87ca191fdf6.1622821729.git.qemu_oss@crudebyte.com>

hw/9pfs/9p.c

@@ -1444,7 +1444,6 @@ static void coroutine_fn v9fs_attach(void *opaque)
     }
     err += offset;
 
-    memcpy(&s->root_qid, &qid, sizeof(qid));
     memcpy(&s->root_st, &stbuf, sizeof(stbuf));
     trace_v9fs_attach_return(pdu->tag, pdu->id,
                              qid.type, qid.version, qid.path);

hw/9pfs/9p.h

@@ -355,7 +355,6 @@ struct V9fsState {
     int32_t root_fid;
     Error *migration_blocker;
     V9fsConf fsconf;
-    V9fsQID root_qid;
     struct stat root_st;
     dev_t dev_id;
     struct qht qpd_table;