Update changelog; simplify BtCallback

CHANGELOG.md

@@ -5,12 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.47.0] - 2023-09-02
+## [0.47.0] - 2023-09-19
 * MSRV raised to 1.71
 * New `experimental` module - `bt` - providing Bluetooth support based on the ESP-IDF Bluedroid implementation
   * Only classic BT supported for now (on the ESP32) with the following profiles: A2DP sink, AVRC controller, HFP client, GAP
   * BLE support in the works, but not buildable yet
-* TLS over TCP/IP support in the `tls` module via `EspTls` and `AsyncEspTls`
+* TLS over TCP/IP support in the `tls` module via `EspTls` and (for async mode) `AsyncEspTls`
 * PSK support for `mqtt`
 * Dependencies `esp-idf-sys` and `esp-idf-hal` are now re-exported as `esp_idf_svc::sys` and `esp_idf_svc::hal`
 * Upgraded to `embedded-svc` 0.26

src/bt.rs

@@ -138,7 +138,7 @@ impl From<esp_bt_uuid_t> for BtUuid {
 #[allow(clippy::type_complexity)]
 pub(crate) struct BtCallback<A, R> {
     initialized: AtomicBool,
-    callback: UnsafeCell<Option<alloc::boxed::Box<alloc::boxed::Box<dyn Fn(A) -> R>>>>,
+    callback: UnsafeCell<Option<alloc::boxed::Box<dyn Fn(A) -> R>>>,
     default_result: R,
 }
 
@@ -165,7 +165,7 @@ where
 
         let b: alloc::boxed::Box<dyn Fn(A) -> R + 'd> = alloc::boxed::Box::new(callback);
         let b: alloc::boxed::Box<dyn Fn(A) -> R + 'static> = unsafe { core::mem::transmute(b) };
-        *unsafe { self.callback.get().as_mut() }.unwrap() = Some(alloc::boxed::Box::new(b));
+        *unsafe { self.callback.get().as_mut() }.unwrap() = Some(b);
 
         Ok(())
     }
@@ -181,7 +181,7 @@ where
     }
 
     pub unsafe fn call(&self, arg: A) -> R {
-        if let Some(callback) = unsafe { self.callback.get().as_ref() }.unwrap().as_ref() {
+        if let Some(callback) = unsafe { self.callback.get().as_ref() }.unwrap() {
             (callback)(arg)
         } else {
             self.default_result.clone()