fireworks: Fix a bug to check the number of MBLA data channels

Conditions to check MBLA data channels are wrong.
fireworks: Remove checking MIDI conformant data channels because of duplexing
fireworks/bebob/oxfw: Don't check return value of snprintf()

I misunderstood the meaning.
firewire-lib: Add sorting in-packets for full duplex streams with sync

In full duplex streams with synchronization, consistency of SYT field in
in-packets is important for out-packets. This commit add sorting in-packets
according to the value of dbc.