Skip symlink in restore_tmpcon()

If magisktmp is /sbin, there may exist files which is symlink to files in
root dir. As root is RO, setcontext will fail and break iterating loop.

native/src/core/selinux.rs

@@ -83,9 +83,11 @@ pub(crate) fn restore_tmpcon() -> LoggedResult<()> {
     let mut path = cstr::buf::default();
     let mut dir = Directory::open(tmp)?;
     while let Some(ref e) = dir.read()? {
+        if !e.is_symlink() {
             e.resolve_path(&mut path)?;
             path.set_secontext(SYSTEM_CON)?;
         }
+    }
 
     path.clear();
     path.append_path(tmp).append_path(LOG_PIPE);