fix: fix warnings

Signed-off-by: YdrMaster <[email protected]>

Author: YdrMaster

rustsbi-qemu/src/clint.rs

@@ -1,8 +1,7 @@
 use crate::{hart_id, trap_stack::remote_hsm};
 use aclint::SifiveClint;
-use core::{cell::UnsafeCell, mem::MaybeUninit, ptr::NonNull};
+use core::{mem::MaybeUninit, ptr::NonNull};
 use rustsbi::{spec::binary::SbiRet, HartMask, Ipi, Timer};
-use spin::Once;
 
 pub(crate) struct Clint;
 

xtask/src/main.rs

@@ -144,7 +144,7 @@ impl QemuArgs {
             _ => panic!(),
         };
         let status = Qemu::system("riscv64")
-            .args(&["-machine", "virt"])
+            .args(["-machine", "virt"])
             .arg("-nographic")
             .arg("-bios")
             .arg(sbi)