path: follow symbolic link for parent path

[zj: When we lstat the target path, symlinks above the last component
     will be followed by both stat and lstat. So when we look at the
     parent, we should follow symlinks.]

src/shared/path-util.c

@@ -519,7 +519,7 @@ fallback:
         if (r < 0)
                 return r;
 
-        r = lstat(parent, &b);
+        r = stat(parent, &b);
         if (r < 0)
                 return -errno;