wifi: iwlwifi: pcie: fix locking on invalid TOP reset

If a TOP reset were to ever be erroneously requested on HW
prior to SC, the code warns and returns, but doesn't take
care to unlock the mutex in this case. Fix that.

Fixes: 909e1be ("wifi: iwlwifi: implement TOP reset")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202506100707.WAnP5ePA-lkp@intel.com/
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250625204210.19a0378838b1.I6bdc58d4996e995e1358ad94d4cc5017f3abf47b@changeid
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>

Author: jmberg-intel

drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c

@@ -546,8 +546,10 @@ int iwl_trans_pcie_gen2_start_fw(struct iwl_trans *trans,
 	}
 
 	if (WARN_ON(trans->do_top_reset &&
-		    trans->mac_cfg->device_family < IWL_DEVICE_FAMILY_SC))
-		return -EINVAL;
+		    trans->mac_cfg->device_family < IWL_DEVICE_FAMILY_SC)) {
+		ret = -EINVAL;
+		goto out;
+	}
 
 	/* we need to wait later - set state */
 	if (trans->do_top_reset)