Fix a few clippy warnings

embassy-boot/boot/src/lib.rs

@@ -28,6 +28,7 @@ impl Partition {
     }
 
     /// Return the length of the partition
+    #[allow(clippy::len_without_is_empty)]
     pub const fn len(&self) -> usize {
         self.to - self.from
     }
@@ -229,8 +230,7 @@ impl BootLoader {
 
         // Copy contents from partition N to active
         let state = self.read_state(p, magic)?;
-        match state {
-            State::Swap => {
+        if state == State::Swap {
             //
             // Check if we already swapped. If we're in the swap state, this means we should revert
             // since the app has failed to mark boot as successful
@@ -253,8 +253,6 @@ impl BootLoader {
                 fstate.write(self.state.from as u32, magic)?;
             }
         }
-            _ => {}
-        }
         Ok(state)
     }
 
@@ -1005,7 +1003,7 @@ mod tests {
         const ERASE_SIZE: usize = ERASE_SIZE;
 
         type EraseFuture<'a> = impl Future<Output = Result<(), Self::Error>> + 'a;
-        fn erase<'a>(&'a mut self, from: u32, to: u32) -> Self::EraseFuture<'a> {
+        fn erase(&mut self, from: u32, to: u32) -> Self::EraseFuture<'_> {
             async move {
                 let from = from as usize;
                 let to = to as usize;