backend/ipp: Change handling of job_canceled #74
Merged
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job_canceled can be -1, 0, or 1. 0 indicates no error, 1 indicates
that we were cancelled in normal operations (user cancelled from
computer) and -1 indicates cancelled by printer. There is clearly
an assumption that -1 is false since there is a check for
job_canceled < 0 a few lines later.