builder/qemu: properly prepare boot command.

builder/qemu/builder.go

@@ -217,6 +217,7 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 	}
 
 	errs = packer.MultiErrorAppend(errs, b.config.FloppyConfig.Prepare(&b.config.ctx)...)
+	errs = packer.MultiErrorAppend(errs, b.config.VNCConfig.Prepare(&b.config.ctx)...)
 
 	if b.config.NetDevice == "" {
 		b.config.NetDevice = "virtio-net"

builder/qemu/step_type_boot_command.go

@@ -48,7 +48,7 @@ func (s *stepTypeBootCommand) Run(ctx context.Context, state multistep.StateBag)
 	}
 
 	// Wait the for the vm to boot.
-	if int64(config.BootConfig.BootWait) > 0 {
+	if int64(config.BootWait) > 0 {
 		ui.Say(fmt.Sprintf("Waiting %s for boot...", config.BootWait.String()))
 		select {
 		case <-time.After(config.BootWait):