macintosh/windfarm: Remove obsolete cleanup for clientdata

A few new i2c-drivers came into the kernel which clear the clientdata-pointer
on exit or error. This is obsolete meanwhile, the core will do it.

Signed-off-by: Wolfram Sang <[e-mail]>
Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

drivers/macintosh/windfarm_smu_sat.c

···
 		wf_unregister_sensor(&sens->sens);
 	}
 	sat->i2c = NULL;
-	i2c_set_clientdata(client, NULL);
 	kref_put(&sat->ref, wf_sat_release);
 
 	return 0;