vmxnet3: fix NICState cleanup

Use qemu_del_nic() instead of qemu_del_net_client() to correctly free
the entire NICState.

Cc: qemu-stable@nongnu.org
Reported-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

hw/net/vmxnet3.c

@@ -1892,7 +1892,7 @@ static void vmxnet3_net_uninit(VMXNET3State *s)
     vmxnet_tx_pkt_reset(s->tx_pkt);
     vmxnet_tx_pkt_uninit(s->tx_pkt);
     vmxnet_rx_pkt_uninit(s->rx_pkt);
-    qemu_del_net_client(qemu_get_queue(s->nic));
+    qemu_del_nic(s->nic);
 }
 
 static void vmxnet3_net_init(VMXNET3State *s)