wifi: iwlwifi: mvm: prefer RCU_INIT_POINTER()

For constant values we don't need rcu_assign_pointer(),
use RCU_INIT_POINTER() instead.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230418122405.7b400d21a27f.Iccdef9d777677390a9881c88b06c0ed13a83d978@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -3314,8 +3314,8 @@ void iwl_mvm_sta_pre_rcu_remove(struct ieee80211_hw *hw,
 						     lockdep_is_held(&mvm->mutex));
 		sta_id = link_sta->sta_id;
 		if (sta == rcu_access_pointer(mvm->fw_id_to_mac_id[sta_id])) {
-			rcu_assign_pointer(mvm->fw_id_to_mac_id[sta_id],
-					   ERR_PTR(-ENOENT));
+			RCU_INIT_POINTER(mvm->fw_id_to_mac_id[sta_id],
+					 ERR_PTR(-ENOENT));
 			RCU_INIT_POINTER(mvm->fw_id_to_link_sta[sta_id], NULL);
 		}
 	}

drivers/net/wireless/intel/iwlwifi/mvm/sta.c

@@ -2152,7 +2152,7 @@ int iwl_mvm_allocate_int_sta(struct iwl_mvm *mvm,
 	sta->type = type;
 
 	/* put a non-NULL value so iterating over the stations won't stop */
-	rcu_assign_pointer(mvm->fw_id_to_mac_id[sta->sta_id], ERR_PTR(-EINVAL));
+	RCU_INIT_POINTER(mvm->fw_id_to_mac_id[sta->sta_id], ERR_PTR(-EINVAL));
 	return 0;
 }