Fix some unused items.

Author: reitermarkus

src/libstd/sys/unix/freertos/thread.rs

@@ -5,8 +5,6 @@ use crate::ptr;
 use crate::sys::mutex::Mutex;
 use crate::time::Duration;
 use crate::sync::{Arc, atomic::{AtomicUsize, Ordering::SeqCst}};
-use crate::sys_common::thread::*;
-use crate::pin::Pin;
 
 use crate::sys::ffi::*;
 use crate::sys::thread_local;

src/libstd/sys/unix/freertos/thread_local.rs

@@ -23,7 +23,7 @@ unsafe fn set_tls(tls: *mut Tls) {
 
 #[inline]
 pub unsafe fn cleanup() {
-    if let Some(mut tls) = get_tls().as_mut() {
+    if let Some(tls) = get_tls().as_mut() {
         let tls = Box::from_raw(tls);
 
         LOCK.read();
@@ -73,10 +73,10 @@ pub unsafe fn set(key: Key, value: *mut u8) {
     }
 
 
-    let mut tls = if let Some(mut tls) = get_tls().as_mut() {
+    let tls = if let Some(tls) = get_tls().as_mut() {
         tls
     } else {
-        let mut tls = Box::into_raw(box Tls::new());
+        let tls = Box::into_raw(box Tls::new());
         set_tls(tls);
         &mut *tls
     };