iwlwifi: pcie: use the cfg we passed to iwl_trans_pcie_alloc()

Instead of using iwl_trans->cfg in iwl_trans_pcie_alloc(), use the
local argument that we received.  This will allow us to not to set the
cfg during iwl_trans_alloc() so it can be decided later.
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

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

@@ -3481,7 +3481,7 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
 	 * "dash" value). To keep hw_rev backwards compatible - we'll store it
 	 * in the old format.
 	 */
-	if (trans->cfg->trans.device_family >= IWL_DEVICE_FAMILY_8000) {
+	if (cfg->trans.device_family >= IWL_DEVICE_FAMILY_8000) {
 		unsigned long flags;
 
 		trans->hw_rev = (trans->hw_rev & 0xfff0) |
@@ -3497,7 +3497,7 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
 		 * in-order to recognize C step driver should read chip version
 		 * id located at the AUX bus MISC address space.
 		 */
-		ret = iwl_finish_nic_init(trans, &trans->cfg->trans);
+		ret = iwl_finish_nic_init(trans, &cfg->trans);
 		if (ret)
 			goto out_no_pci;
 
@@ -3524,7 +3524,7 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
 #if IS_ENABLED(CONFIG_IWLMVM)
 	trans->hw_rf_id = iwl_read32(trans, CSR_HW_RF_ID);
 
-	if (trans->cfg == &iwlax210_2ax_cfg_so_hr_a0) {
+	if (cfg == &iwlax210_2ax_cfg_so_hr_a0) {
 		if (trans->hw_rev == CSR_HW_REV_TYPE_TY) {
 			trans->cfg = &iwlax210_2ax_cfg_ty_gf_a0;
 		} else if (CSR_HW_RF_ID_TYPE_CHIP_ID(trans->hw_rf_id) ==