Fix UnboundLocalError on net_put (#71086)

changelogs/fragments/net_put-unboundlocalerror.yaml

@@ -0,0 +1,4 @@
+---
+bugfixes:
+  - net_put - Fixed UnboundLocalError when there is no change
+    This is a backport from U(https://github.com/ansible-collections/ansible.netcommon/pull/6)

lib/ansible/plugins/action/net_put.py

@@ -35,6 +35,7 @@ display = Display()
 class ActionModule(ActionBase):
 
     def run(self, tmp=None, task_vars=None):
+        changed = False
         socket_path = None
         network_os = self._get_network_os(task_vars).split('.')[-1]
         persistent_connection = self._play_context.connection.split('.')[-1]