[stable-5] Fix pylint errors (#5938)

Fix pylint errors (#5933)

* Fix pylint errors.

* Also adjust to https://github.com/ansible/ansible/pull/79909.

(cherry picked from commit b1d9507cd2)

plugins/modules/system/timezone.py

@@ -356,6 +356,7 @@ class NosystemdTimezone(Timezone):
     def __init__(self, module):
         super(NosystemdTimezone, self).__init__(module)
         # Validate given timezone
+        planned_tz = ''
         if 'name' in self.value:
             tzfile = self._verify_timezone()
             planned_tz = self.value['name']['planned']

plugins/modules/system/xfconf.py

@@ -169,8 +169,8 @@ from ansible_collections.community.general.plugins.module_utils.xfconf import xf
 
 
 class XFConfProperty(StateModuleHelper):
-    change_params = 'value',
-    diff_params = 'value',
+    change_params = ('value', )
+    diff_params = ('value', )
     output_params = ('property', 'channel', 'value')
     facts_params = ('property', 'channel', 'value')
     module = dict(