Remove unused variables from nxos_ping / nxos_snapshot (#62933)

This was caught by our network collections lint jobs.

Signed-off-by: Paul Belanger <pabelanger@redhat.com>

lib/ansible/modules/network/nxos/nxos_ping.py

@@ -188,8 +188,6 @@ def main():
 
     module = AnsibleModule(argument_spec=argument_spec, supports_check_mode=True)
 
-    warnings = list()
-
     destination = module.params['dest']
     state = module.params['state']
 

lib/ansible/modules/network/nxos/nxos_snapshot.py

@@ -321,8 +321,6 @@ def main():
                            required_if=required_if,
                            supports_check_mode=True)
 
-    warnings = list()
-
     action = module.params['action']
     comparison_results_file = module.params['comparison_results_file']