Fix warnings

src/header/pthread/mod.rs

@@ -1,10 +1,10 @@
 //! pthread.h implementation for Redox, following https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/pthread.h.html
 
-use core::{cell::Cell, ptr::NonNull};
+use core::cell::Cell;
 
 use crate::{
     header::{sched::*, time::timespec},
-    platform::{self, types::*, Pal, Sys},
+    platform::{types::*, Pal, Sys},
     pthread,
 };
 

src/header/pthread/mutex.rs

@@ -1,8 +1,6 @@
 use super::*;
 
-use crate::{header::errno::*, pthread::Errno};
-
-use core::sync::atomic::AtomicI32 as AtomicInt;
+use crate::pthread::Errno;
 
 // PTHREAD_MUTEX_INITIALIZER is defined in bits_pthread/cbindgen.toml