Revert "ksud_magic: probe for more workdir candidates (#221)"

This reverts commit a68b4fe7e0.

userspace/ksud_magic/src/utils.rs

@@ -1,6 +1,6 @@
 use anyhow::{Context, Error, Ok, Result, bail};
 use std::{
-    fs::{self, create_dir_all, remove_file, write, File, OpenOptions},
+    fs::{create_dir_all, remove_file, write, File, OpenOptions},
     io::{
         ErrorKind::{AlreadyExists, NotFound},
         Write,
@@ -177,38 +177,6 @@ pub fn has_magisk() -> bool {
     which::which("magisk").is_ok()
 }
 
-fn is_ok_empty(dir: &str) -> bool {
-    use std::result::Result::Ok;
-
-    match fs::read_dir(dir) {
-        Ok(mut entries) => entries.next().is_none(),
-        Err(_) => false,
-    }
-}
-
-pub fn get_tmp_path() -> String {
-    let dirs = [
-        "/debug_ramdisk",
-        "/patch_hw",
-        "/oem",
-        "/root",
-        "/sbin",
-    ];
-
-    // find empty directory
-    for dir in dirs {
-        if is_ok_empty(dir) {
-            return dir.to_string();
-        }
-    }
-    "".to_string()
-}
-
-pub fn get_work_dir() -> String {
-     let tmp_path = get_tmp_path();
-     format!("{}/workdir/", tmp_path)
-}
-
 #[cfg(target_os = "android")]
 fn link_ksud_to_bin() -> Result<()> {
     let ksu_bin = PathBuf::from(defs::DAEMON_PATH);