drm/i915/buddy: use kmemleak_update_trace

Since nodes are cached in a free-list, and potentially marked as free
without actually being destroyed, thus allowing them to be
opportunistically re-allocated, we should apply kmemleak_update_trace
every time a node is given a new owner and marked as allocated, to aid
in debugging.
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190816105357.14340-2-matthew.auld@intel.com

drivers/gpu/drm/i915/i915_buddy.c

@@ -3,6 +3,7 @@
  * Copyright © 2019 Intel Corporation
  */
 
+#include <linux/kmemleak.h>
 #include <linux/slab.h>
 
 #include "i915_buddy.h"
@@ -304,6 +305,7 @@ i915_buddy_alloc(struct i915_buddy_mm *mm, unsigned int order)
 	}
 
 	mark_allocated(block);
+	kmemleak_update_trace(block);
 	return block;
 
 out_free: