[SCSI] Fix transport class oops

There's an oops that sometimes shows up with SCSI transport classes in
sysfs_hash_and_remove.  The problem is that now, because of the class to
device and vice versa symlinks, all classes have to be removed from
visibility *before* the device is removed from visibility.

The transport class trigger points violate this, so bring them back into
conformance.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>