[PATCH] Make reiserfs BUG on too big transaction

Make reiserfs BUG() when somebody tries to start a larger transaction than
it's allowed (currently the code just silently deadlocks).

Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Chris Mason <mason@suse.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>