drm/amdkfd: Fix an inappropriate error handling in allloc memory of gpu

We should unreference a gem object instead of an amdgpu bo here.

Fixes: fd9a9f88 ("drm/amdgpu: Use GEM obj reference for KFD BOs")
Signed-off-by: Lang Yu <lang.yu@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1503,7 +1503,7 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
 	remove_kgd_mem_from_kfd_bo_list(*mem, avm->process_info);
 	drm_vma_node_revoke(&gobj->vma_node, drm_priv);
 err_node_allow:
-	amdgpu_bo_unref(&bo);
+	drm_gem_object_put(gobj);
 	/* Don't unreserve system mem limit twice */
 	goto err_reserve_limit;
 err_bo_create: