Finish introduction of ->reinit() - Jens had missed MOD_DEC_USE_COUNT on
several exits from ide-cd one and forgot to remove the loop from
ide-floppy ide-tape and ide-scsi ones ;-) (->reinit() is the body of
loop in ->init() - stuff that should be done one drive; in 2.5.32
ide-disk one is OK, ide-cd is OK modulo minor bugs and in the rest it's
a copy of ->init())