Fix a python warning in format_changelog.py.

diff --git a/scripts/maint/format_changelog.py b/scripts/maint/format_changelog.py
index 7cf55a0d964b1ca9319d1dbe0d32b199fbd6c5ab..b37ece04c04dc36ec0f044bb7e776a13f59f1508 100755 (executable)
--- a/scripts/maint/format_changelog.py
+++ b/scripts/maint/format_changelog.py
@@ -291,7 +291,7 @@ class ChangeLog(object):
             self.curgraf.append(line)
 
         else:
-            assert "This" is "unreachable"  # noqa: F632
+            assert False  # This should be unreachable.
 
     def lint_head(self, line, head):
         m = re.match(r'^ *o ([^\(]+)((?:\([^\)]+\))?):', head)