[JFFS2] Fix suspend failure with JFFS2 GC thread.

The try_to_freeze() call was in the wrong place; we need it in the
signal-pending loop now that a pending freeze also makes
signal_pending() return true.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

fs/jffs2/background.c

@@ -83,7 +83,7 @@ static int jffs2_garbage_collect_thread(void *_c)
 
 	for (;;) {
 		allow_signal(SIGHUP);
-
+	again:
 		if (!jffs2_thread_should_wake(c)) {
 			set_current_state (TASK_INTERRUPTIBLE);
 			D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread sleeping...\n"));
@@ -94,9 +94,6 @@ static int jffs2_garbage_collect_thread(void *_c)
 			schedule();
 		}
 
-		if (try_to_freeze())
-			continue;
-
 		/* This thread is purely an optimisation. But if it runs when
 		   other things could be running, it actually makes things a
 		   lot worse. Use yield() and put it at the back of the runqueue
@@ -111,6 +108,9 @@ static int jffs2_garbage_collect_thread(void *_c)
 			siginfo_t info;
 			unsigned long signr;
 
+			if (try_to_freeze())
+				goto again;
+
 			signr = dequeue_signal_lock(current, &current->blocked, &info);
 
 			switch(signr) {