lint: Remove unused imports

embassy-net/src/udp.rs

@@ -1,4 +1,3 @@
-use core::cell::RefCell;
 use core::future::poll_fn;
 use core::mem;
 use core::task::Poll;
@@ -6,7 +5,7 @@ use core::task::Poll;
 use embassy_net_driver::Driver;
 use smoltcp::iface::{Interface, SocketHandle};
 use smoltcp::socket::udp::{self, PacketMetadata};
-use smoltcp::wire::{IpAddress, IpEndpoint, IpListenEndpoint};
+use smoltcp::wire::{IpEndpoint, IpListenEndpoint};
 
 use crate::Stack;