Get rid of some warnings

embassy-nrf/src/util/peripheral.rs

@@ -68,7 +68,7 @@ impl<S: PeripheralState> PeripheralMutex<S> {
 
 impl<S: PeripheralState> Drop for PeripheralMutex<S> {
     fn drop(&mut self) {
-        if let Some((state, irq)) = &mut self.inner {
+        if let Some((_state, irq)) = &mut self.inner {
             irq.disable();
             irq.remove_handler();
         }

embassy-nrf/src/util/ring_buffer.rs

@@ -1,4 +1,4 @@
-use crate::fmt::{assert, panic, todo, *};
+use crate::fmt::{assert, *};
 
 pub struct RingBuffer<'a> {
     buf: &'a mut [u8],