iwlwifi: dbg: check trigger data before access

Without trigger data set, no point in any collection.
so check that we have the info for collecting the data.
Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20220304131517.5fb34fb1f0eb.I4d7f2a4d162e80474540c5caf1194ed7d32977bc@changeidSigned-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/dbg.c

@@ -2905,6 +2905,11 @@ static void iwl_fw_dbg_collect_sync(struct iwl_fw_runtime *fwrt, u8 wk_idx)
 	if (!test_bit(wk_idx, &fwrt->dump.active_wks))
 		return;
 
+	if (!dump_data->trig) {
+		IWL_ERR(fwrt, "dump trigger data is not set\n");
+		goto out;
+	}
+
 	if (!test_bit(STATUS_DEVICE_ENABLED, &fwrt->trans->status)) {
 		IWL_ERR(fwrt, "Device is not enabled - cannot dump error\n");
 		goto out;