wifi: iwlwifi: mvm: fix potential memory leak

If we do get multiple notifications from firmware, then
we might have allocated 'notif', but don't free it. Fix
that by checking for duplicates before allocation.

Fixes: 4da46a06 ("wifi: iwlwifi: mvm: Add support for wowlan info notification")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230418122405.116758321cc4.I8bdbcbb38c89ac637eaa20dda58fa9165b25893a@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/d3.c

@@ -2722,6 +2722,13 @@ static bool iwl_mvm_wait_d3_notif(struct iwl_notif_wait_data *notif_wait,
 	case WIDE_ID(PROT_OFFLOAD_GROUP, WOWLAN_INFO_NOTIFICATION): {
 		struct iwl_wowlan_info_notif *notif;
 
+		if (d3_data->notif_received & IWL_D3_NOTIF_WOWLAN_INFO) {
+			/* We might get two notifications due to dual bss */
+			IWL_DEBUG_WOWLAN(mvm,
+					 "Got additional wowlan info notification\n");
+			break;
+		}
+
 		if (wowlan_info_ver < 2) {
 			struct iwl_wowlan_info_notif_v1 *notif_v1 = (void *)pkt->data;
 
@@ -2740,13 +2747,6 @@ static bool iwl_mvm_wait_d3_notif(struct iwl_notif_wait_data *notif_wait,
 			notif = (void *)pkt->data;
 		}
 
-		if (d3_data->notif_received & IWL_D3_NOTIF_WOWLAN_INFO) {
-			/* We might get two notifications due to dual bss */
-			IWL_DEBUG_WOWLAN(mvm,
-					 "Got additional wowlan info notification\n");
-			break;
-		}
-
 		d3_data->notif_received |= IWL_D3_NOTIF_WOWLAN_INFO;
 		len = iwl_rx_packet_payload_len(pkt);
 		iwl_mvm_parse_wowlan_info_notif(mvm, notif, d3_data->status,