add unused_mut lint

src/header/stdio/default.rs

@@ -1,13 +1,7 @@
 use super::{BUFSIZ, Buffer, FILE, constants};
 use core::{cell::UnsafeCell, ptr};
 
-use crate::{
-    fs::File,
-    header::pthread,
-    io::LineWriter,
-    platform::types::c_int,
-    sync::{Mutex, Once},
-};
+use crate::{fs::File, header::pthread, io::LineWriter, platform::types::c_int, sync::Once};
 use alloc::{boxed::Box, vec::Vec};
 
 // TODO: Change FILE to allow const fn initialization?
@@ -17,7 +11,7 @@ impl GlobalFile {
     fn new(file: c_int, flags: c_int) -> Self {
         let file = File::new(file);
         let writer = Box::new(LineWriter::new(unsafe { file.get_ref() }));
-        let mut mutex_attr = pthread::RlctMutexAttr {
+        let mutex_attr = pthread::RlctMutexAttr {
             ty: pthread::PTHREAD_MUTEX_RECURSIVE,
             ..Default::default()
         };

src/header/stdio/helpers.rs

@@ -9,7 +9,7 @@ use crate::{
     error::Errno,
     fs::File,
     header::{
-        errno::{self, EINVAL},
+        errno::EINVAL,
         fcntl::{
             F_GETFL, F_SETFD, F_SETFL, FD_CLOEXEC, O_APPEND, O_CLOEXEC, O_CREAT, O_EXCL, O_RDONLY,
             O_RDWR, O_TRUNC, O_WRONLY, fcntl,
@@ -17,11 +17,7 @@ use crate::{
         pthread,
     },
     io::BufWriter,
-    platform::{
-        self,
-        types::{c_int, c_ulonglong},
-    },
-    sync::Mutex,
+    platform::types::{c_int, c_ulonglong},
 };
 use alloc::vec::Vec;
 
@@ -79,7 +75,7 @@ pub fn _fdopen(fd: c_int, mode: CStr) -> Result<Box<FILE>, Errno> {
 
     let file = File::new(fd);
     let writer = Box::new(BufWriter::new(unsafe { file.get_ref() }));
-    let mut mutex_attr = pthread::RlctMutexAttr {
+    let mutex_attr = pthread::RlctMutexAttr {
         ty: pthread::PTHREAD_MUTEX_RECURSIVE,
         ..Default::default()
     };