opal-elog-parse: Exit nicely on missing operation
If parameters are specified but without an operation,
opal-elog-parse just returns -1. Exit nicely to let
the user know they need to specify an operation.
Signed-off-by: Samuel Mendoza-Jonas <firstname.lastname@example.org>
Signed-off-by: Vasant Hegde <email@example.com>
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