drm/amdgpu: initialize bo_va_list when add gws to process

bo_va_list is list_head, so initialize it.

Signed-off-by: xinhui pan <[e-mail]>
Reviewed-by: Feifei Xu <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 		return -ENOMEM;
 
 	mutex_init(&(*mem)->lock);
+	INIT_LIST_HEAD(&(*mem)->bo_va_list);
 	(*mem)->bo = amdgpu_bo_ref(gws_bo);
 	(*mem)->domain = AMDGPU_GEM_DOMAIN_GWS;
 	(*mem)->process_info = process_info;