drm/amdgpu: add missing unreserve on error

The amdgpu_bo_unreserve() has to be done on the error path as well.

Fixes: 9e5d2753 ("drm/amdgpu: Move kfd_mem_attach outside reservation")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: NFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c

@@ -624,11 +624,10 @@ kfd_mem_attach_userptr(struct amdgpu_device *adev, struct kgd_mem *mem,
 				       AMDGPU_GEM_CREATE_PREEMPTIBLE,
 				       ttm_bo_type_sg, mem->bo->tbo.base.resv,
 				       &gobj);
+	amdgpu_bo_unreserve(mem->bo);
 	if (ret)
 		return ret;
 
-	amdgpu_bo_unreserve(mem->bo);
-
 	*bo = gem_to_amdgpu_bo(gobj);
 	(*bo)->parent = amdgpu_bo_ref(mem->bo);