Add missing parameter to aften_encode_frame() call
Problem:
int res = aften_encode_frame(&fAftenContext, fAC3Buffer + SPDIF_HEADER_SIZE, fSampleBuffer);
Fails, because API is
AFTEN_API int aften_encode_frame(AftenContext *s, unsigned char *frame_buffer,const void *samples, int count)
The additional parameter 'count' was added to libaften function aften_encode_frame() here:
https://github.com/buserror/aften/commit/
e1cbb66628de8aa496a75092d8d694234c67aa95#diff-d4868af7d235a914aef2ec4f979fcb9fR87
Solves https://github.com/jackaudio/jack2/issues/455