ibmasmfs: make register_filesystem the last failure exit

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/misc/ibmasm/module.c b/drivers/misc/ibmasm/module.c
index 1ccedb71..168d800 100644
--- a/drivers/misc/ibmasm/module.c
+++ b/drivers/misc/ibmasm/module.c
@@ -211,18 +211,17 @@
 
 static int __init ibmasm_init(void)
 {
-	int result;
+	int result = pci_register_driver(&ibmasm_driver);
+	if (result)
+		return result;
 
 	result = ibmasmfs_register();
 	if (result) {
+		pci_unregister_driver(&ibmasm_driver);
 		err("Failed to register ibmasmfs file system");
 		return result;
 	}
-	result = pci_register_driver(&ibmasm_driver);
-	if (result) {
-		ibmasmfs_unregister();
-		return result;
-	}
+
 	ibmasm_register_panic_notifier();
 	info(DRIVER_DESC " version " DRIVER_VERSION " loaded");
 	return 0;