cups/request.c: Show filename in message in `cupsDoFileRequest()`

OpenPrinting / cups

OpenPrinting CUPS Sources

https://openprinting.github.io/cups

Apache License 2.0

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Closed zdohnal closed 3 months ago

zdohnal commented 3 months ago

Show which file we tried to access in the error message, if we have issues accessing it.

Related #904