all: address clippy lints

src/utils/buffd/buf_in.rs

@@ -78,7 +78,7 @@ impl BufFdIn {
         match self.ring.recvmsg(&self.fd, &mut iov, &mut self.in_fd).await {
             Ok(0) => return Err(BufFdError::Closed),
             Ok(n) => self.in_right += n,
-            Err(e) => return Err(BufFdError::Ring(e.into())),
+            Err(e) => return Err(BufFdError::Ring(e)),
         }
         if self.in_fd.len() > MAX_IN_FD {
             return Err(BufFdError::TooManyFds);

src/utils/smallmap.rs

@@ -64,7 +64,7 @@ impl<K: Eq, V, const N: usize> SmallMap<K, V, N> {
 
     pub fn clear(&self) {
         unsafe {
-            let _v = self.m.get().deref_mut().clear();
+            self.m.get().deref_mut().clear();
         }
     }