sysfs: windfarm: init sysfs attributes

This is required for lockdep.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/macintosh/windfarm_core.c b/drivers/macintosh/windfarm_core.c
index 437f55c..419795f 100644
--- a/drivers/macintosh/windfarm_core.c
+++ b/drivers/macintosh/windfarm_core.c
@@ -321,6 +321,7 @@
 	kref_init(&new_sr->ref);
 	list_add(&new_sr->link, &wf_sensors);
 
+	sysfs_attr_init(&new_sr->attr.attr);
 	new_sr->attr.attr.name = new_sr->name;
 	new_sr->attr.attr.mode = 0444;
 	new_sr->attr.show = wf_show_sensor;