shutil.rmtree: call onerror with correct function

The onerror is supposed to be called with failed function, but in this case lstat is wrongly used instead of open.

Lib/shutil.py

@@ -708,7 +708,7 @@ def onerror(*args):
         try:
             fd = os.open(path, os.O_RDONLY)
         except Exception:
-            onerror(os.lstat, path, sys.exc_info())
+            onerror(os.open, path, sys.exc_info())
             return
         try:
             if os.path.samestat(orig_st, os.fstat(fd)):