KVM: x86: Avoid using plain integer as NULL pointer warning
This patch fix the following sparse warning: for file arch/x86/kvm/x86.c: warning: Using plain integer as NULL pointer Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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