net/vhost: fix queue update
net/vhost: fix queue update

Now that the vhost library saves the guest notifications
enablement value in its virtqueues metadata, it is not
necessary to do it in the vring_state_changed callback.

One effect of the patch is also to prevent possible
deadlock happening in vhost library.

Fixes: 604052ae5395 ("net/vhost: support queue update")

Reported-by: Yinan Wang <49b1c4c1483798ccfe23a5285410aaacc037c97a@intel.com>
Signed-off-by: Maxime Coquelin <9a2667dee3b90866bbc9c2696cff2b7d5616c95a@redhat.com>
Tested-by: Yinan Wang <49b1c4c1483798ccfe23a5285410aaacc037c97a@intel.com>
Reviewed-by: Chenbo Xia <5d298a4585cd22ca5d29de25967a5599c4c324c8@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk