[POWERPC] windfarm: don't die on suspend thread signal

When the windfarm thread gets a suspend signal it will die instead of
freezing. This fixes it.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

drivers/macintosh/windfarm_core.c

@@ -94,8 +94,6 @@ static int wf_thread_func(void *data)
 	DBG("wf: thread started\n");
 
 	while(!kthread_should_stop()) {
-		try_to_freeze();
-
 		if (time_after_eq(jiffies, next)) {
 			wf_notify(WF_EVENT_TICK, NULL);
 			if (wf_overtemp) {
@@ -118,8 +116,8 @@ static int wf_thread_func(void *data)
 		if (delay <= HZ)
 			schedule_timeout_interruptible(delay);
 
-		/* there should be no signal, but oh well */
-		if (signal_pending(current)) {
+		/* there should be no non-suspend signal, but oh well */
+		if (signal_pending(current) && !try_to_freeze()) {
 			printk(KERN_WARNING "windfarm: thread got sigl !\n");
 			break;
 		}