python/qom: Do not use 'err' name at module scope

Pylint updated to 2.9.0 upstream, adding new warnings for things that
re-use the 'err' variable. Luckily, this only breaks the
python-check-tox job, which is allowed to fail as a warning.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Message-id: 20210629214323.1329806-2-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

python/qemu/qmp/qom.py

@@ -38,8 +38,8 @@
 
 try:
     from .qom_fuse import QOMFuse
-except ModuleNotFoundError as err:
-    if err.name != 'fuse':
+except ModuleNotFoundError as _err:
+    if _err.name != 'fuse':
         raise
 else:
     assert issubclass(QOMFuse, QOMCommand)