[PATCH] drm/amdgpu: address the static checker warnings

[Evan Quan]

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:4199 amdgpu_device_gpu_recover()
error: we previously assumed 'hive' could be null (see line 4196)

This is introduced by "drm/amdgpu: optimize the gpu reset for XGMI setup V2".

Change-Id: I9c22b57abc9f512114112f93fb035f1fecf26beb
Signed-off-by: Evan Quan <evan.quan at amd.com>
Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 71278942f9f0..898338dc9605 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4274,7 +4274,8 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
 		if (!amdgpu_device_lock_adev(tmp_adev, !hive)) {
 			DRM_INFO("Bailing on TDR for s_job:%llx, as another already in progress",
 				  job ? job->base.id : -1);
-			mutex_unlock(&hive->hive_lock);
+			if (hive)
+				mutex_unlock(&hive->hive_lock);
 			return 0;
 		}
 
-- 
2.26.2