[COMPBATT] Use BATTERY_TAG_INVALID instead 0 when applicable

Author: hpoussin

drivers/bus/acpi/compbatt/compbatt.c

@@ -111,7 +111,7 @@ CompBattRecalculateTag(IN PCOMPBATT_DEVICE_EXTENSION DeviceExtension)
        }
 
        /* No tag for this device extension, clear it */
-       DeviceExtension->Tag = 0;
+       DeviceExtension->Tag = BATTERY_TAG_INVALID;
        NextEntry = NextEntry->Flink;
     }
 
@@ -161,7 +161,7 @@ CompBattQueryTag(IN PCOMPBATT_DEVICE_EXTENSION DeviceExtension,
     }
 
     /* Do we have a tag now? */
-    if ((DeviceExtension->Flags & COMPBATT_TAG_ASSIGNED) && (DeviceExtension->Tag))
+    if ((DeviceExtension->Flags & COMPBATT_TAG_ASSIGNED) && DeviceExtension->Tag != BATTERY_TAG_INVALID)
     {
         /* Return the tag */
         *Tag = DeviceExtension->Tag;
@@ -170,7 +170,7 @@ CompBattQueryTag(IN PCOMPBATT_DEVICE_EXTENSION DeviceExtension,
     else
     {
         /* No tag */
-        *Tag = 0;
+        *Tag = BATTERY_TAG_INVALID;
         Status = STATUS_NO_SUCH_DEVICE;
     }
 
@@ -261,7 +261,7 @@ CompBattGetBatteryInformation(OUT PBATTERY_INFORMATION BatteryInfo,
             InputBuffer.AtRate = 0;
 
             /* Make sure the battery has a tag */
-            if (BatteryData->Tag)
+            if (BatteryData->Tag != BATTERY_TAG_INVALID)
             {
                 /* Do we already have the data? */
                 if (!(BatteryData->Flags & COMPBATT_BATTERY_INFORMATION_PRESENT))
@@ -419,7 +419,7 @@ CompBattGetBatteryGranularity(OUT PBATTERY_REPORTING_SCALE ReportingScale,
             InputBuffer.InformationLevel = BatteryGranularityInformation;
 
             /* Make sure the battery has a tag */
-            if (BatteryData->Tag)
+            if (BatteryData->Tag != BATTERY_TAG_INVALID)
             {
                 /* Send the IOCTL to query the information */
                 RtlZeroMemory(&BatteryData->BatteryInformation,

drivers/bus/acpi/compbatt/comppnp.c

@@ -134,7 +134,7 @@ CompBattAddNewBattery(IN PUNICODE_STRING BatteryName,
         {
             /* Initialize the data and write the battery name */
             RtlZeroMemory(BatteryData, sizeof(COMPBATT_BATTERY_DATA));
-            BatteryData->Tag = 0;
+            BatteryData->Tag = BATTERY_TAG_INVALID;
             BatteryData->BatteryName.MaximumLength = BatteryName->Length;
             BatteryData->BatteryName.Buffer = (PWCHAR)(BatteryData + 1);
             RtlCopyUnicodeString(&BatteryData->BatteryName, BatteryName);