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This just adds a helper function to check if a device is configured and it converts the target users to use it. The next patch will add a backend module user so those types of modules do not have to know the lio core details. Signed-off-by: Mike Christie <[email protected]> Reviewed-by: Xiubo Li <[email protected]> Signed-off-by: Martin K. Petersen <[email protected]>