[PATCH] drm: via: fix sparse warnings

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Dave Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/char/drm/via_ds.c b/drivers/char/drm/via_ds.c
index daf3df7..5c71e08 100644
--- a/drivers/char/drm/via_ds.c
+++ b/drivers/char/drm/via_ds.c
@@ -133,7 +133,7 @@
 	PMemBlock blocks;
 
 	if (size <= 0)
-		return 0;
+		return NULL;
 
 	blocks = (TMemBlock *) drm_calloc(1, sizeof(TMemBlock), DRM_MEM_DRIVER);
 
@@ -143,7 +143,7 @@
 		blocks->free = 1;
 		return (memHeap_t *) blocks;
 	} else
-		return 0;
+		return NULL;
 }
 
 static TMemBlock *SliceBlock(TMemBlock * p,