staging: Android: Fix NULL pointer related warning in alarm-dev.c file

Fixes the following sparse warning:
drivers/staging/android/alarm-dev.c:259:35: warning: Using plain integer as NULL pointer

Change-Id: Ie4eca65f820ee67d695030a885eb45438d7b279e
Cc: Brian Swetland <swetland@google.com>
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
diff --git a/drivers/staging/android/alarm-dev.c b/drivers/staging/android/alarm-dev.c
index f72aa38..ab9eb43 100644
--- a/drivers/staging/android/alarm-dev.c
+++ b/drivers/staging/android/alarm-dev.c
@@ -256,7 +256,7 @@
 	unsigned long flags;
 
 	spin_lock_irqsave(&alarm_slock, flags);
-	if (file->private_data != 0) {
+	if (file->private_data) {
 		for (i = 0; i < ANDROID_ALARM_TYPE_COUNT; i++) {
 			uint32_t alarm_type_mask = 1U << i;
 			if (alarm_enabled & alarm_type_mask) {