[REGRESSION] ALSA: firewire-lib: heavy digital distortion with Fireface 800

Bisection revealed that the bitcrushing distortion with RME FireFace 800 was caused by 1d717123bb1a7555 ("ALSA: firewire-lib: Avoid -Wflex-array-member-not-at-end warning").

Reverting this commit yields restoration of clear audio output. I will send in a patch reverting this commit for now, soonTM.

#regzbot introduced: 1d717123bb1a7555