Fixes gcc '-Wunused-but-set-variable' warning:
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c: In function 'update_gpuvm_pte':
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c:840:20: warning:
 variable 'bo' set but not used [-Wunused-but-set-variable]
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c:838:20: warning:
 variable 'vm' set but not used [-Wunused-but-set-variable]
They're never used since introduction in 
a46a2cd103a8 ("drm/amdgpu: Add GPUVM
memory management functions for KFD")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
                struct amdgpu_sync *sync)
 {
        int ret;
-       struct amdgpu_vm *vm;
-       struct amdgpu_bo_va *bo_va;
-       struct amdgpu_bo *bo;
-
-       bo_va = entry->bo_va;
-       vm = bo_va->base.vm;
-       bo = bo_va->base.bo;
+       struct amdgpu_bo_va *bo_va = entry->bo_va;
 
        /* Update the page tables  */
        ret = amdgpu_vm_bo_update(adev, bo_va, false);