systemd: Fix build error

letmein-systemd/src/lib.rs

@@ -11,10 +11,7 @@
 #[cfg(not(any(target_os = "linux", target_os = "android")))]
 std::compile_error!("letmeind server and letmein-systemd do not support non-Linux platforms.");
 
-use anyhow as ah;
-
-#[cfg(any(feature = "tcp", feature = "unix"))]
-use anyhow::{format_err as err, Context as _};
+use anyhow::{self as ah, format_err as err, Context as _};
 
 #[cfg(any(feature = "tcp", feature = "unix"))]
 use std::{
@@ -137,6 +134,7 @@ impl SystemdSocket {
     /// Get all sockets from systemd.
     ///
     /// All environment variables related to this operation will be cleared.
+    #[allow(unused_mut)]
     pub fn get_all() -> ah::Result<Vec<SystemdSocket>> {
         let mut sockets = vec![];
         if sd_notify::booted().unwrap_or(false) {
@@ -168,6 +166,7 @@ impl SystemdSocket {
                     continue;
                 }
 
+                let _ = fd;
                 return Err(err!("Received unknown socket from systemd"));
             }
         }