cargo clippy & fmt

os/src/syscall/fs.rs

@@ -7,9 +7,9 @@ pub fn sys_write(fd: usize, buf: *const u8, len: usize) -> isize {
             let str = core::str::from_utf8(slice).unwrap();
             print!("{}", str);
             len as isize
-        },
+        }
         _ => {
             panic!("Unsupported fd in sys_write!");
         }
     }
-}
+}

os/src/syscall/mod.rs

@@ -18,4 +18,3 @@ pub fn syscall(syscall_id: usize, args: [usize; 3]) -> isize {
         _ => panic!("Unsupported syscall_id: {}", syscall_id),
     }
 }
-

os/src/syscall/process.rs

@@ -1,7 +1,4 @@
-use crate::task::{
-    suspend_current_and_run_next,
-    exit_current_and_run_next,
-};
+use crate::task::{exit_current_and_run_next, suspend_current_and_run_next};
 use crate::timer::get_time_ms;
 
 pub fn sys_exit(exit_code: i32) -> ! {
@@ -17,4 +14,4 @@ pub fn sys_yield() -> isize {
 
 pub fn sys_get_time() -> isize {
     get_time_ms() as isize
-}
+}