isar_bh() bh handler calls another (compatible) bh handler - BChannel_bh()
- but passes struct BCState* instead of struct work_struct*, which seems
wrong.

Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>