scsi: core: Add a precondition check in scsi_eh_scmd_add()

Calling scsi_eh_scmd_add() may cause the error handler never to be woken up
because this may result in shost->host_failed to become larger than
scsi_host_busy(shost). Hence complain if scsi_eh_scmd_add() is called after
SCMD_STATE_INFLIGHT has been cleared.

Cc: Hannes Reinecke <[email protected]>
Cc: Damien Le Moal <[email protected]>
Cc: Mike Christie <[email protected]>
Cc: John Garry <[email protected]>
Cc: Ming Lei <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

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