ipmi: Rework SMI registration failure

There were certain situations where ipmi_register_smi() would
return a failure, but the interface would still be registered
and would need to be unregistered.  This is obviously a bad
design and resulted in an oops in certain failure cases.

If the interface is started up in ipmi_register_smi(), then
an error occurs, shut down the interface there so the
cleanup can be done properly.

Fix the various smi users, too.

Signed-off-by: Corey Minyard <[email protected]>
Reported-by: Justin Ernst <[email protected]>
Tested-by: Justin Ernst <[email protected]>
Cc: Andrew Banman <[email protected]>
Cc: Russ Anderson <[email protected]>
Cc: <[email protected]> # 4.18.x

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