chase-symlink: when converting directory O_PATH fd to real fd, don't bother with /proc/

Replaces: #25581

src/basic/chase-symlinks.c

@@ -557,7 +557,7 @@ int chase_symlinks_and_opendir(
                 return r;
         assert(path_fd >= 0);
 
-        d = opendir(FORMAT_PROC_FD_PATH(path_fd));
+        d = xopendirat(path_fd, ".", O_NOFOLLOW);
         if (!d)
                 return -errno;