leds: leds-qpnp: Add NULL terminator to fix crash issue

Add NULL terminator at the end of led device attribute to fix
crash issue at led probe.

Change-Id: I0344d623afcdd7c027bb7552f510f21069b939cb
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>
diff --git a/drivers/leds/leds-qpnp.c b/drivers/leds/leds-qpnp.c
index ac06fc5..e88e574 100644
--- a/drivers/leds/leds-qpnp.c
+++ b/drivers/leds/leds-qpnp.c
@@ -991,6 +991,7 @@
 static struct attribute *led_attrs[] = {
 	&dev_attr_led_mode.attr,
 	&dev_attr_strobe.attr,
+	NULL
 };
 
 static const struct attribute_group led_attr_group = {