drm: use NULL instead of 0

From: Randy Dunlap <rdunlap@xenotime.net>

Use NULL instead of 0 (sparse warnings):

drivers/char/drm/ati_pcigart.c:64:10: warning: Using plain integer as NULL
pointer
drivers/char/drm/ati_pcigart.c:130:21: warning: Using plain integer as NULL
pointer
drivers/char/drm/ati_pcigart.c:171:14: warning: Using plain integer as NULL
pointer

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/char/drm/ati_pcigart.c b/drivers/char/drm/ati_pcigart.c
index 5485382cadec..7d2a885b5db0 100644
--- a/drivers/char/drm/ati_pcigart.c
+++ b/drivers/char/drm/ati_pcigart.c
@@ -61,7 +61,7 @@ static void *drm_ati_alloc_pcigart_table(void)
 
         address = __get_free_pages(GFP_KERNEL, ATI_PCIGART_TABLE_ORDER);
         if (address == 0UL) {
-                return 0;
+                return NULL;
         }
 
         page = virt_to_page(address);
@@ -127,7 +127,7 @@ int drm_ati_pcigart_cleanup(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
         if (gart_info->gart_table_location == DRM_ATI_GART_MAIN
             && gart_info->addr) {
                 drm_ati_free_pcigart_table(gart_info->addr);
-                gart_info->addr = 0;
+                gart_info->addr = NULL;
         }
 
         return 1;
@@ -168,7 +168,7 @@ int drm_ati_pcigart_init(drm_device_t *dev, drm_ati_pcigart_info *gart_info)
                 if (bus_address == 0) {
                         DRM_ERROR("unable to map PCIGART pages!\n");
                         drm_ati_free_pcigart_table(address);
-                        address = 0;
+                        address = NULL;
                         goto done;
                 }
         } else {