PM / Domains: Replace plain integer with NULL pointer in domain.c file

Fixes the following sparse warning:
drivers/base/power/domain.c:1679:55: warning: Using plain integer as NULL pointer

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 4f8e0d2..8d67417 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1676,7 +1676,7 @@
 
 	if (dev->power.subsys_data->domain_data) {
 		gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
-		gpd_data->ops = (struct gpd_dev_ops){ 0 };
+		gpd_data->ops = (struct gpd_dev_ops){ NULL };
 		if (clear_td)
 			gpd_data->td = (struct gpd_timing_data){ 0 };