wifi: iwlwifi: pcie: clear FW debug memory on init

When we restart the firmware, we shouldn't keep old debug data
around. Since the "allocate" function might not reallocate the
memory block (it's only freed when we unbind from the device),
clear the memory to have a clean slate for debug data.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230613155501.73c32255a132.Ibd7101dcd285b01ee879fddfbf52c30d49ced3c0@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/pcie/trans.c

 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
- * Copyright (C) 2007-2015, 2018-2022 Intel Corporation
+ * Copyright (C) 2007-2015, 2018-2023 Intel Corporation
  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
  * Copyright (C) 2016-2017 Intel Deutschland GmbH
  */
@@ -171,8 +171,10 @@ static void iwl_pcie_alloc_fw_monitor_block(struct iwl_trans *trans,
 	u32 size = 0;
 	u8 power;
 
-	if (fw_mon->size)
+	if (fw_mon->size) {
+		memset(fw_mon->block, 0, fw_mon->size);
 		return;
+	}
 
 	for (power = max_power; power >= min_power; power--) {
 		size = BIT(power);
@@ -215,9 +217,6 @@ void iwl_pcie_alloc_fw_monitor(struct iwl_trans *trans, u8 max_power)
 		 max_power))
 		return;
 
-	if (trans->dbg.fw_mon.size)
-		return;
-
 	iwl_pcie_alloc_fw_monitor_block(trans, max_power, 11);
 }