bcm2835_audio_callback: Don't process garbage if there is no message.
If vchi_msg_dequeue failed due to an empty queue, return rather than treating stack garbage as a valid message.
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@ -207,6 +207,8 @@ bcm2835_audio_callback(void *param, const VCHI_CALLBACK_REASON_T reason, void *m
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status = vchi_msg_dequeue(sc->vchi_handle,
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&m, sizeof m, &msg_len, VCHI_FLAGS_NONE);
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if (status != 0)
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return;
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if (m.type == VC_AUDIO_MSG_TYPE_RESULT) {
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if (m.u.result.success) {
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device_printf(sc->dev,
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