Fail on empty AudioRecord read()

If read() returns 0, then there is no data. According to the
documentation, it happens if the buffer is not a direct buffer:
<https://developer.android.com/reference/android/media/AudioRecord#read(java.nio.ByteBuffer,%20int)>

Refs #3812 <https://github.com/Genymobile/scrcpy/issues/3812>