feat: Optimize some codes (ksud) (#465)

* chore: make cargo clippy happy

Signed-off-by: Tools-app <localhost.hutao@gmail.com>

* chore: Optimize import
-  Format as a standard import

Signed-off-by: Tools-app <localhost.hutao@gmail.com>

---------

Signed-off-by: Tools-app <localhost.hutao@gmail.com>

userspace/ksud/src/su.rs

@@ -1,22 +1,20 @@
-use anyhow::{Ok, Result};
-use getopts::Options;
-use std::env;
 #[cfg(unix)]
 use std::os::unix::process::CommandExt;
-use std::path::PathBuf;
-use std::{ffi::CStr, process::Command};
-
-use crate::{
-    defs,
-    utils::{self, umask},
-};
+use std::{env, ffi::CStr, path::PathBuf, process::Command};
 
+use anyhow::{Ok, Result};
+use getopts::Options;
 #[cfg(any(target_os = "linux", target_os = "android"))]
 use rustix::{
     process::getuid,
     thread::{Gid, Uid, set_thread_res_gid, set_thread_res_uid},
 };
 
+use crate::{
+    defs,
+    utils::{self, umask},
+};
+
 #[cfg(any(target_os = "linux", target_os = "android"))]
 pub fn grant_root(global_mnt: bool) -> Result<()> {
     rustix::process::ksu_grant_root()?;