PCI: endpoint: Fix error handling in epf_ntb_epc_cleanup()

There are two issues related to epf_ntb_epc_cleanup():

  1) It should call epf_ntb_config_sspad_bar_clear()
  2) The epf_ntb_bind() function should call epf_ntb_epc_cleanup()
     to cleanup.

I also changed the ordering a bit.  Unwinding should be done in the
mirror order from how they are allocated.

Fixes: e35f56bb ("PCI: endpoint: Support NTB transfer between RC and EP")
Link: https://lore.kernel.org/linux-pci/aaffbe8d-7094-4083-8146-185f4a84e8a1@moroto.mountainSigned-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

drivers/pci/endpoint/functions/pci-epf-vntb.c

@@ -799,8 +799,9 @@ static int epf_ntb_epc_init(struct epf_ntb *ntb)
  */
 static void epf_ntb_epc_cleanup(struct epf_ntb *ntb)
 {
-	epf_ntb_db_bar_clear(ntb);
 	epf_ntb_mw_bar_clear(ntb, ntb->num_mws);
+	epf_ntb_db_bar_clear(ntb);
+	epf_ntb_config_sspad_bar_clear(ntb);
 }
 
 #define EPF_NTB_R(_name)						\
@@ -1337,7 +1338,7 @@ static int epf_ntb_bind(struct pci_epf *epf)
 	ret = pci_register_driver(&vntb_pci_driver);
 	if (ret) {
 		dev_err(dev, "failure register vntb pci driver\n");
-		goto err_bar_alloc;
+		goto err_epc_cleanup;
 	}
 
 	ret = vpci_scan_bus(ntb);
@@ -1348,6 +1349,8 @@ static int epf_ntb_bind(struct pci_epf *epf)
 
 err_unregister:
 	pci_unregister_driver(&vntb_pci_driver);
+err_epc_cleanup:
+	epf_ntb_epc_cleanup(ntb);
 err_bar_alloc:
 	epf_ntb_config_spad_bar_free(ntb);