Fixed all coding style issues reported by checkpatch.pl.
This includes:
- Trailing statements on new lines.
- Added missing blank lines after declarations.
- Corrected indentation of switch/case statements and labels.
- Added comments for memory barriers.
- Removed unnecessary braces.
Added Kdocs to all public functions and data structures to
improve code documentation.
This commit includes:
- Reverted audio stream decoupling to restore original behavior.
- Implemented SysEx state machine and error retry for MIDI handling.
- Performed memory leak audit and confirmed no obvious leaks.
- Optimized playback and capture data copying for efficiency.
- Reordered `tascam_card` structure for improved cache locality.
- Fixed `active_urbs` counter management to prevent "URBs still active" errors.