fix: mistakes caught in code review

cve_bin_tool/extractor.py

@@ -99,9 +99,8 @@ async def extract_file_tar(self, filename, extraction_path):
 
             # FIXME: the backported fix is not working on windows.
             # this leaves the current (unsafe) behaviour so we can fix at least one OS for now
-            if sys.platform == "win32":
+            elif sys.platform == "win32":
                 tar.extractall(path=extraction_path)  # nosec
-                tar.close()
 
             # Some versions may need us to implement a filter to avoid unsafe behaviour
             # we could consider logging a warning here