Resolve std warnings on VEXos

Author: lewisfm

library/std/src/sys/fs/vexos.rs

@@ -1,4 +1,4 @@
-use crate::ffi::{CString, OsString};
+use crate::ffi::OsString;
 use crate::fmt;
 use crate::fs::TryLockError;
 use crate::hash::Hash;
@@ -277,7 +277,7 @@ impl File {
                     }
 
                     if *truncate {
-                        unsafe { vex_sdk::vexFileOpenCreate(path.as_ptr()) }
+                        vex_sdk::vexFileOpenCreate(path.as_ptr())
                     } else {
                         // Open in append, but jump to the start of the file.
                         let fd = vex_sdk::vexFileOpenWrite(path.as_ptr());

library/std/src/sys/pal/vexos/mod.rs

@@ -6,7 +6,7 @@ pub mod thread;
 pub mod time;
 
 use crate::arch::global_asm;
-use crate::ptr::{self, addr_of_mut};
+use crate::ptr;
 use crate::sys::stdio;
 use crate::time::{Duration, Instant};
 

library/std/src/sys/pal/vexos/thread.rs

@@ -1,7 +1,6 @@
 use super::unsupported;
 use crate::ffi::CStr;
 use crate::io;
-use crate::num::NonZero;
 use crate::time::{Duration, Instant};
 
 #[expect(dead_code)]

library/std/src/sys/stdio/vexos.rs

@@ -54,16 +54,13 @@ impl io::Write for Stdout {
                 self.flush().unwrap();
             }
 
-            let count = unsafe {
+            let count: usize = unsafe {
                 vex_sdk::vexSerialWriteBuffer(STDIO_CHANNEL, chunk.as_ptr(), chunk.len() as u32)
-            } as usize;
-
-            if count < 0 {
-                return Err(io::Error::new(
-                    io::ErrorKind::Uncategorized,
-                    "Internal write error occurred.",
-                ));
             }
+            .try_into()
+            .map_err(|_| {
+                io::Error::new(io::ErrorKind::Uncategorized, "Internal write error occurred.")
+            })?;
 
             written += count;