drm/xe: Call exit functions when xe_register_pci_driver() fails

Move xe_register_pci_driver() and xe_unregister_pci_driver() to
init_funcs to make sure that exit functions are also called when
xe_register_pci_driver() fails.

Note that this also allows adding init functions to be run after
xe_register_pci_driver().

v2:
 - Move functions to init_funcs instead of having a special case for
   xe_register_pci_driver(). (Jani)

Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_module.c

@@ -45,6 +45,10 @@ static const struct init_funcs init_funcs[] = {
 		.init = xe_sched_job_module_init,
 		.exit = xe_sched_job_module_exit,
 	},
+	{
+		.init = xe_register_pci_driver,
+		.exit = xe_unregister_pci_driver,
+	},
 };
 
 static int __init xe_init(void)
@@ -60,15 +64,13 @@ static int __init xe_init(void)
 		}
 	}
 
-	return xe_register_pci_driver();
+	return 0;
 }
 
 static void __exit xe_exit(void)
 {
 	int i;
 
-	xe_unregister_pci_driver();
-
 	for (i = ARRAY_SIZE(init_funcs) - 1; i >= 0; i--)
 		init_funcs[i].exit();
 }