fix crash during start when helper not installed

during initialization setting ctx.bitmask as soon as vpn.Init()
returns and by not returning error from launcher.FirewallStop
this works around the issue where the app crashes because of calling
methods of the Bitmask object which was nil

the launcher.FirewallStop method returned an error when the helper
was not installed

pkg/backend/init.go

@@ -74,9 +74,10 @@ func initializeBitmask(errCh chan string, opts *InitOpts) {
 			Err(err).
 			Msg("Could not initialize bitmask")
 		errCh <- err.Error()
-		return
 	}
 
+	ctx.bm = b
+
 	// right now we just get autostart from an init flag,
 	// but we want to be able to persist that option from the preferences
 	// pane
@@ -99,7 +100,6 @@ func initializeBitmask(errCh chan string, opts *InitOpts) {
 		log.Error().Msg("Could not find polkit")
 		errCh <- "nopolkit"
 	}
-	ctx.bm = b
 	ctx.IsReady = true
 }
 

pkg/vpn/bitmask.go

@@ -119,8 +119,7 @@ func Init() (*Bitmask, error) {
 		Str("caCertPath", b.getTempCaCertPath()).
 		Msg("Sucessfully wrote OpenVPN CA certificate (hardcoded in the binary, not coming from API)")
 
-	err = b.launch.FirewallStop()
-	if err != nil {
+	if err := b.launch.FirewallStop(); err != nil {
 		log.Warn().
 			Err(err).
 			Msg("Could not stop firewall")