platform/x86: dell-wmi: remove sparse_keymap_free() calls

As sparse_keymap_setup() now uses a managed memory allocation for the
keymap copy it creates, the latter is freed automatically.  Remove all
calls to sparse_keymap_free().

As this reduces dell_wmi_input_destroy() to one line, replace all calls
to that function with direct calls to input_unregister_device().
Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/dell-wmi.c

@@ -603,23 +603,15 @@ static int __init dell_wmi_input_setup(void)
 
 	err = input_register_device(dell_wmi_input_dev);
 	if (err)
-		goto err_free_keymap;
+		goto err_free_dev;
 
 	return 0;
 
- err_free_keymap:
-	sparse_keymap_free(dell_wmi_input_dev);
  err_free_dev:
 	input_free_device(dell_wmi_input_dev);
 	return err;
 }
 
-static void dell_wmi_input_destroy(void)
-{
-	sparse_keymap_free(dell_wmi_input_dev);
-	input_unregister_device(dell_wmi_input_dev);
-}
-
 /*
  * Descriptor buffer is 128 byte long and contains:
  *
@@ -740,7 +732,7 @@ static int __init dell_wmi_init(void)
 	status = wmi_install_notify_handler(DELL_EVENT_GUID,
 					 dell_wmi_notify, NULL);
 	if (ACPI_FAILURE(status)) {
-		dell_wmi_input_destroy();
+		input_unregister_device(dell_wmi_input_dev);
 		pr_err("Unable to register notify handler - %d\n", status);
 		return -ENODEV;
 	}
@@ -752,7 +744,7 @@ static int __init dell_wmi_init(void)
 		if (err) {
 			pr_err("Failed to enable WMI events\n");
 			wmi_remove_notify_handler(DELL_EVENT_GUID);
-			dell_wmi_input_destroy();
+			input_unregister_device(dell_wmi_input_dev);
 			return err;
 		}
 	}
@@ -766,6 +758,6 @@ static void __exit dell_wmi_exit(void)
 	if (wmi_requires_smbios_request)
 		dell_wmi_events_set_enabled(false);
 	wmi_remove_notify_handler(DELL_EVENT_GUID);
-	dell_wmi_input_destroy();
+	input_unregister_device(dell_wmi_input_dev);
 }
 module_exit(dell_wmi_exit);