fixup! fixup! fixup! fixup! Utilize LDREX/STREX in GPIO configure functions

Author: Sh3Rm4n

CHANGELOG.md

@@ -22,7 +22,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Deprecate `Toggle` enum and use `Switch` instead for better naming purposes
   ([#334])
   - Add `impl From<Toggle> for Switch` to reduce churn.
-No changes.
+
 ### Breaking Changes
 
 - The MSRV was bumped to 1.64 ([???])

examples/dac_sine.rs

@@ -19,7 +19,7 @@ fn main() -> ! {
     // let clocks = rcc.cfgr.freeze(&mut dp.FLASH.constrain().acr);
 
     // Set up pin PA4 as analog pin.
-    let mut gpioa = dp.GPIOA.split(&mut rcc.ahb);
+    let gpioa = dp.GPIOA.split(&mut rcc.ahb);
     let _dac1_out1 = gpioa.pa4.into_analog();
 
     // set up led for blinking loop