Add missing must_use to SleepCfg::set_startup (#376)

Author: newAM

CHANGELOG.md

@@ -11,6 +11,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Updated minimum `chrono` version to `0.4.23` to satisfy `cargo-audit`.
 - Changed minimum supported rust version from 1.60 to 1.62.
 
+### Fixed
+- Added a missing `must_use` in `SleepCfg::set_startup`.
+
 ## [0.6.1] - 2022-08-01
 ### Fixed
 - Fixed undefined behavior in SPI full duplex RX DMA transfers.

hal/src/subghz/sleep_cfg.rs

@@ -60,6 +60,7 @@ impl SleepCfg {
     /// # assert_eq!(u8::from(SLEEP_CFG), 0b001);
     /// # assert_eq!(u8::from(SLEEP_CFG.set_startup(Startup::Warm)), 0b101);
     /// ```
+    #[must_use = "set_startup returns a modified SleepCfg"]
     pub const fn set_startup(mut self, startup: Startup) -> SleepCfg {
         if startup as u8 == 1 {
             self.0 |= 1 << 2