Fix an ancient race in sync progress reporter

Author: ppolewicz

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+* Fix a race in progress reporter
+
 ## [1.17.1] - 2022-06-23
 
 ### Fixed

b2sdk/scan/report.py

@@ -84,10 +84,9 @@ def print_completion(self, message):
         :type message: str
         """
         with self.lock:
-            if not self.closed:
-                self._print_line(message, True)
-                self._last_update_time = 0
-                self._update_progress()
+            self._print_line(message, True)
+            self._last_update_time = 0
+            self._update_progress()
 
     def update_count(self, delta: int):
         """