From 9216ed294053be68a673754a0f8da88aa7fb7941 Mon Sep 17 00:00:00 2001
From: Oded Gabbay <oded.gabbay@amd.com>
Date: Mon, 12 Jan 2015 22:34:21 +0200
Subject: [PATCH] drm/amdkfd: Don't BUG on freeing GART sub-allocation

Instead of creating a BUG if trying to free a NULL GART sub-allocation object,
just return 0 (success).

This is done to mirror behavior of kfree.

Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
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