kvm: kvm_destroy_vm_debugfs(): check debugfs_stat_data pointer
This make it possible to call kvm_destroy_vm_debugfs() from kvm_create_vm_debugfs() in error conditions. Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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