Remove redundant redefinition from print stations example

examples/print_stations.rs

@@ -12,7 +12,6 @@ fn main() {
  let socket = NlSocket::connect().unwrap();
  let interfaces = socket.list_interfaces().unwrap();
  for interface in interfaces {
- let interface = interface;
  let stations = socket.list_stations(interface.interface_index).unwrap();
  for station in stations {
  println!("{station:#?}");