Freezer: Fix JFFS2 garbage collector freezing issue (rev. 2)

Fix breakage caused by commit d5d8c5976d6adeddb8208c240460411e2198b393
"freezer: do not send signals to kernel threads" in
jffs2_garbage_collect_thread() that assumed it would be sent signals
by the freezer.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Pete MacKay <armlinux@architechnical.net>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c
index d568ae8..8adebd3 100644
--- a/fs/jffs2/background.c
+++ b/fs/jffs2/background.c
@@ -105,7 +105,7 @@
 
 		/* Put_super will send a SIGKILL and then wait on the sem.
 		 */
-		while (signal_pending(current)) {
+		while (signal_pending(current) || freezing(current)) {
 			siginfo_t info;
 			unsigned long signr;