selftests: KVM: Fix kvm device helper ioctl assertions
The KVM_CREATE_DEVICE and KVM_{GET,SET}_DEVICE_ATTR ioctls are defined to return a value of zero on success. As such, tighten the assertions in the helper functions to only pass if the return code is zero. Suggested-by: Andrew Jones <drjones@redhat.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Signed-off-by: Oliver Upton <oupton@google.com> Message-Id: <20210916181555.973085-4-oupton@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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