Fix resource warning found manually

Lib/distutils/command/sdist.py

@@ -294,6 +294,7 @@ class sdist(Command):
                             join_lines=1, lstrip_ws=1, rstrip_ws=1,
                             collapse_join=1)
 
+        try:
             while True:
                 line = template.readline()
                 if line is None:            # end of file
@@ -305,6 +306,8 @@ class sdist(Command):
                     self.warn("%s, line %d: %s" % (template.filename,
                                                    template.current_line,
                                                    msg))
+        finally:
+            template.close()
 
     def prune_file_list(self):
         """Prune off branches that might slip into the file list as created