chore: remove channel blocking in qemu launch

The channel is never read from.

Signed-off-by: fazledyn-or <ataf@openrefactory.com>
Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

pkg/provision/providers/qemu/launch.go

@@ -394,6 +394,8 @@ func launchVM(config *LaunchConfig) error {
 				return fmt.Errorf("failed to kill process %w", err)
 			}
 
+			<-done
+
 			return fmt.Errorf("process stopped")
 		case err := <-done:
 			if err != nil {