In atapi_cam_reinit_bus, only call reinit_bus if the ATAPI channel has already been registered with ATAPI/CAM (else there is nothing to do). atapi_cam_reinit_bus may be called before the bus is registered if an ATAPI command times out during the boot sequence.
In atapi_cam_reinit_bus, only call reinit_bus if the ATAPI channel
has already been registered with ATAPI/CAM (else there is nothing
to do). atapi_cam_reinit_bus may be called before the bus is
registered if an ATAPI command times out during the boot sequence.

PR:		i386/51421
Reviewed by:	roberto
Approved by:	re (rwatson)
MFC after:	1 week

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