V4L/DVB (13957): IR: Fix sysfs attributes declaration

This patch fixes the declaration of the sysfs attributes for IR's, which
must be a NULL-terminated array of struct attribute *.
Without this patch, my machine crashes when inserting a DVB card.

Signed-off-by: Francesco Lavra <francescolavra@interfree.it>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/IR/ir-sysfs.c b/drivers/media/IR/ir-sysfs.c
index 6ec7f89..bf5fbcd 100644
--- a/drivers/media/IR/ir-sysfs.c
+++ b/drivers/media/IR/ir-sysfs.c
@@ -125,6 +125,7 @@
 
 static struct attribute *ir_dev_attrs[] = {
 	&dev_attr_current_protocol.attr,
+	NULL,
 };
 
 /**