queues may be set to 1, as well as fds may contain only one fd.
No reason to block such cases. Let's check exactly number of queues.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
---
 net/tap.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/net/tap.c b/net/tap.c
index c6bea0dcab..288cfedd81 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -870,13 +870,6 @@ int net_init_tap(const Netdev *netdev, const char *name,
     assert(netdev->type == NET_CLIENT_DRIVER_TAP);
     tap = &netdev->u.tap;
 
-    /* QEMU hubs do not support multiqueue tap, in this case peer is set.
-     * For -netdev, peer is always NULL. */
-    if (peer && (tap->has_queues || tap->fds || tap->vhostfds)) {
-        error_setg(errp, "Multiqueue tap cannot be used with hubs");
-        return -1;
-    }
-
     if (tap->has_vhost && !tap->vhost && (tap->vhostfds || tap->vhostfd)) {
         error_setg(errp, "vhostfd(s)= is not valid without vhost");
         return -1;
@@ -900,6 +893,15 @@ int net_init_tap(const Netdev *netdev, const char *name,
         return -1;
     }
 
+    /*
+     * QEMU hubs do not support multiqueue tap, in this case peer is set.
+     * For -netdev, peer is always NULL.
+     */
+    if (peer && queues > 1) {
+        error_setg(errp, "Multiqueue tap cannot be used with hubs");
+        goto fail;
+    }
+
     if (!tap_parse_vhost_fds(tap, &vhost_fds, queues, errp)) {
         goto fail;
     }
-- 
2.52.0