FS-Cache: Initialise the object event mask with the calculated mask

Initialise the object event mask with the calculated mask rather than unmasking
undefined events also.

Signed-off-by: David Howells <[e-mail]>

fs/fscache/object.c

···
 		/* wait for the parent object to become ready */
 	case FSCACHE_OBJECT_INIT:
 		object->event_mask =
-			ULONG_MAX & ~(1 << FSCACHE_OBJECT_EV_CLEARED);
+			FSCACHE_OBJECT_EVENTS_MASK &
+			~(1 << FSCACHE_OBJECT_EV_CLEARED);
 		fscache_initialise_object(object);
 		goto done;