KVM: explicitly set rmap_head->val to 0 in pte_list_desc_remove_entry()
When we reach here, we have desc->sptes[j] = NULL with j = 0. So we can replace desc->sptes[0] with 0 to make it more clear. Signed-off-by: NMiaohe Lin <linmiaohe@huawei.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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