fix: fix ksud install error (#550)

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

userspace/ksud/src/utils.rs

@@ -46,7 +46,7 @@ pub fn ensure_file_exists<T: AsRef<Path>>(file: T) -> Result<()> {
 
 pub fn ensure_dir_exists<T: AsRef<Path>>(dir: T) -> Result<()> {
     let result = create_dir_all(&dir);
-    if dir.as_ref().is_dir() && result.is_err() {
+    if dir.as_ref().is_dir() && result.is_ok() {
         Ok(())
     } else {
         bail!("{} is not a regular directory", dir.as_ref().display())