lkl: Minor cleanup to virtio_net

This commit adds a meaningful name for one of the constants in
virtio_net, and avoids using memset in init_queue_locks by more careful
bookkeeping.

Signed-off-by: Patrick Collins <pscollins@google.com>

tools/lkl/lib/virtio_net.c

@@ -12,6 +12,7 @@
 #define RX_QUEUE_IDX 0
 #define TX_QUEUE_IDX 1
 #define NUM_QUEUES (TX_QUEUE_IDX + 1)
+#define QUEUE_DEPTH 32
 
 #ifdef DEBUG
 #define bad_request(s) do { \
@@ -143,11 +144,10 @@ static struct lkl_mutex_t **init_queue_locks(int num_queues)
  if (!ret)
  return NULL;
 
- memset(ret, 0, sizeof(struct lkl_mutex_t*) * num_queues);
  for (i = 0; i < num_queues; i++) {
  ret[i] = lkl_host_ops.mutex_alloc();
  if (!ret[i]) {
- free_queue_locks(ret, num_queues);
+ free_queue_locks(ret, i);
  return NULL;
  }
  }
@@ -193,7 +193,7 @@ int lkl_netdev_add(union lkl_netdev nd, void *mac)
  * could init the queues in virtio_dev_setup to help enforce
  * this, but netdevs are the only flavor that need these
  * locks, so it's better to do it here. */
- ret = virtio_dev_setup(&dev->dev, NUM_QUEUES, 32);
+ ret = virtio_dev_setup(&dev->dev, NUM_QUEUES, QUEUE_DEPTH);
 
  if (ret)
  goto out_free;