tools/lib/thermal: Fix thermal_sampling_exit()

thermal_sampling_init() suscribes to THERMAL_GENL_SAMPLING_GROUP_NAME group
so thermal_sampling_exit() should unsubscribe from the same group.

Fixes: 47c4b0de080a ("tools/lib/thermal: Add a thermal library")
Signed-off-by: Vincent Guittot <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Daniel Lezcano <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

tools/lib/thermal/sampling.c

···
 thermal_error_t thermal_sampling_exit(struct thermal_handler *th)
 {
 	if (nl_unsubscribe_thermal(th->sk_sampling, th->cb_sampling,
-				   THERMAL_GENL_EVENT_GROUP_NAME))
+				   THERMAL_GENL_SAMPLING_GROUP_NAME))
 		return THERMAL_ERROR;
 
 	nl_thermal_disconnect(th->sk_sampling, th->cb_sampling);