Removed AllowChangeFlag::NONE and AllowChangeFlag::ANY in favor o…

…f bitflags `empty()` and `all()` function

src/sdl2/mixer/mod.rs

@@ -109,12 +109,10 @@ bitflags!(
 bitflags!(
     /// Which audio format changes are allowed when opening a device ([`open_audio_device`]).
     pub struct AllowChangeFlag: u32 {
-        const NONE = 0;
         const FREQUENCY = sys::SDL_AUDIO_ALLOW_FREQUENCY_CHANGE;
         const FORMAT = sys::SDL_AUDIO_ALLOW_FORMAT_CHANGE;
         const CHANNELS = sys::SDL_AUDIO_ALLOW_CHANNELS_CHANGE;
         const SAMPLES = sys::SDL_AUDIO_ALLOW_SAMPLES_CHANGE;
-        const ANY = sys::SDL_AUDIO_ALLOW_ANY_CHANGE;
     }
 );
 
@@ -201,7 +199,7 @@ pub fn open_audio(
 /// `SDL_mixer` can select what the hardware demands instead of the app. For a given
 /// [`AllowChangeFlag`], If it is not specified, `SDL_mixer` must convert data behind the scenes
 /// between what the app demands and what the hardware requires. If your app needs precisely what
-/// is requested, specify [`AllowChangeFlag::NONE`].
+/// is requested, specify [`AllowChangeFlag::empty`].
 ///
 /// * `frequency`: The frequency to playback audio at (in Hz).
 /// * `format`: Audio format ([`AudioFormat`]).
@@ -219,7 +217,8 @@ pub fn open_audio_device<D>(
     chunksize: i32,
     device: D,
     allowed_changes: AllowChangeFlag,
-) -> Result<(), String> where
+) -> Result<(), String>
+where
     D: Into<Option<&str>>,
 {
     let ret = unsafe {