wifi: iwlwifi: don't assume op_mode_nic_config exists

The new op_mode won't have this callback.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Link: https://patch.msgid.link/20240618194245.718983e7b832.I02fb130aa3d2044958cba7dced357031b92e33bb@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-op-mode.h

 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /*
- * Copyright (C) 2005-2014, 2018-2021 Intel Corporation
+ * Copyright (C) 2005-2014, 2018-2021, 2024 Intel Corporation
  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
  * Copyright (C) 2015 Intel Deutschland GmbH
  */
@@ -185,6 +185,7 @@ static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode)
 static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode)
 {
 	might_sleep();
+	if (op_mode->ops->nic_config)
 		op_mode->ops->nic_config(op_mode);
 }