Merge pull request #3843 from eoscloud/fix/network-startup-shared-err-panic

incusd/networks: Fix panic when a network fails to start

Author: stgraber

cmd/incusd/networks.go

@@ -1813,7 +1813,8 @@ func networkStartup(s *state.State) error {
 	var initNetworksMu sync.Mutex
 
 	initNetwork := func(n network.Network, priority int) error {
-		err = n.Start()
+		// Use a local error variable as this runs concurrently.
+		err := n.Start()
 		if err != nil {
 			err = fmt.Errorf("Failed starting: %w", err)