attempted to leave type `c64::sid::SIDAudioDevice` uninitialized, which is invalid about rust64 HOT 2 CLOSED

diff --git a/audio.rs b/home/fred/.cargo/registry/src/github.com-1ecc6299db9ec823/sdl2-0.25.0/src/sdl2/audio.rs
index c5982da..0eaeb00 100644
--- a/audio.rs
+++ b/home/fred/.cargo/registry/src/github.com-1ecc6299db9ec823/sdl2-0.25.0/src/sdl2/audio.rs
@@ -558,6 +558,7 @@ pub struct AudioDevice<CB: AudioCallback> {
     userdata: Box<CB>
 }
 
+use std::mem::MaybeUninit;
 impl<CB: AudioCallback> AudioDevice<CB> {
     /// Opens a new audio device given the desired parameters and callback.
     pub fn open_playback<F>(a: &AudioSubsystem, device: Option<&str>, spec: &AudioSpecDesired, get_callback: F) -> Result<AudioDevice <CB>, String>
@@ -568,7 +569,7 @@ impl<CB: AudioCallback> AudioDevice<CB> {
         // callback without the obtained AudioSpec.
         // Create an uninitialized box that will be initialized after SDL_OpenAudioDevice.
         let userdata: *mut CB = unsafe {
-            let b: Box<CB> = Box::new(mem::uninitialized());
+            let b: Box<MaybeUninit<CB>> = Box::new(MaybeUninit::uninit());
             mem::transmute(b)
         };
         let desired = AudioSpecDesired::convert_to_ll(spec.freq, spec.channels, spec.samples, userdata);