fix cargo fmt warning

Signed-off-by: Weikang Guo <guoweikang@kylinos.cn>

Author: guoweikang

api/src/mm.rs

@@ -15,10 +15,7 @@ use axhal::{
 use axio::prelude::*;
 use axtask::current;
 use memory_addr::{MemoryAddr, PAGE_SIZE_4K, VirtAddr};
-use starry_core::{
-    mm::access_user_memory,
-    task::AsThread,
-};
+use starry_core::{mm::access_user_memory, task::AsThread};
 use starry_vm::{vm_load_until_nul, vm_read_slice, vm_write_slice};
 
 fn check_region(start: VirtAddr, layout: Layout, access_flags: MappingFlags) -> AxResult<()> {

core/src/mm.rs

@@ -1,12 +1,7 @@
 //! User address space management.
 
 use alloc::{borrow::ToOwned, string::String, vec, vec::Vec};
-use core::{
-    ffi::CStr,
-    hint::unlikely,
-    iter,
-    mem::MaybeUninit,
-};
+use core::{ffi::CStr, hint::unlikely, iter, mem::MaybeUninit};
 
 use axerrno::{AxError, AxResult};
 use axfs::{CachedFile, FS_CONTEXT, FileBackend};

core/src/task.rs

@@ -85,7 +85,6 @@ pub struct Thread {
 
     /// Indicates whether the thread is currently accessing user memory.
     accessing_user_memory: AtomicBool,
-
 }
 
 impl Thread {
@@ -155,7 +154,6 @@ impl Thread {
         self.accessing_user_memory
             .store(accessing, Ordering::Release);
     }
-
 }
 
 #[extern_trait]