Use bus_generic_detach instead of device_delete_children in detach
While here, check for errors from bus_generic_detach and move it to
the start of detach if necessary.
Differential Revision: https://reviews.freebsd.org/D47969
Use bus_generic_detach instead of device_delete_children in detach 
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Description Use bus_generic_detach instead of device_delete_children in detach While here, check for errors from bus_generic_detach and move it to Differential Revision: https://reviews.freebsd.org/D47969 
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