ACPI: dock: use NULL for pointer

Use NULL instead of 0 for pointers:
drivers/acpi/dock.c:677:75: warning: Using plain integer as NULL pointer

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 811b1aac65d566f9c215f926d2987db2a384b5ff..4546bf873aea273c2a0993fb3fbb465d801543ed 100644 (file)
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -29,6 +29,7 @@
 #include <linux/notifier.h>
 #include <linux/platform_device.h>
 #include <linux/jiffies.h>
+#include <linux/stddef.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 
@@ -674,7 +675,7 @@ static ssize_t show_dock_uid(struct device *dev,
                             struct device_attribute *attr, char *buf)
 {
        unsigned long lbuf;
-       acpi_status status = acpi_evaluate_integer(dock_station->handle, "_UID", 0, &lbuf);
+       acpi_status status = acpi_evaluate_integer(dock_station->handle, "_UID", NULL, &lbuf);
        if(ACPI_FAILURE(status)) {
            return 0;
        }