Example AN00247 crashes when run

[danielpieczko]

Thread 2.1 hit Catchpoint -1 (XCore Exception ET_ECALL (DI Resource Lane)), 0x00081414 in XUA_AudioHub (clk_audio_mclk=<optimized out>, clk_audio_bclk=0, p_mclk_in=66304, c_aud=<optimized out>, p_lrclk=<optimized out>, p_bclk=<optimized out>, p_i2s_dac=..., p_i2s_adc=..., c_spdif_out=<optimized out>)
    at C:/xmos/usb_audio/lib_xua/lib_xua/src/core/audiohub/xua_audiohub.xc:710
710             else if (((MCLK_48) % curSamFreq) == 0)
C:/xmos/usb_audio/lib_xua/lib_xua/src/core/audiohub/xua_audiohub.xc:790:24: error: passing null argument to a non-null parameter
            p_mclk_in, clk_audio_bclk, divide, curSamFreq);
                       ^~~~~~~~~~~~~~

clk_audio_bclk is null, which is fine as a parameter to XUA_AudioHub, but this one is not nullable when you reach the call to ConfigAudioPortsWrapper.