bpo-39033: Fix NameError in zipimport during hash validation (GH-17588)


Patch by Karthikeyan Singaravelan.
diff --git a/Lib/zipimport.py b/Lib/zipimport.py
index fd917c1..5ef0a17 100644
--- a/Lib/zipimport.py
+++ b/Lib/zipimport.py
@@ -608,7 +608,7 @@
                 )
 
                 try:
-                    _boostrap_external._validate_hash_pyc(
+                    _bootstrap_external._validate_hash_pyc(
                         data, source_hash, fullname, exc_details)
                 except ImportError:
                     return None