Patch - Add logging when file opens fail in datadirect.cpp

[Gary Buhrmaster <gary.buhrmaster@…>]

Discussion on mythtv-users pointed out that there are some code paths that can result in unreported errors when downloading data from Schedules Direct, often due to permission errors when people incorrectly use mixed usernames between mythtv-setup, mythbackend, and mythfilldatabase.

This patch does not address the core issue (re-use of a fixed file name), but provides error reporting so that the logs will identify the error(s) if a file open fails. At least the errors will be now be reported (rather than invisible). Better living through logging.

A later patch (when more fully tested) will use randomized temporary file names where possible, mitigating the most common issues. But I have not yet completed my testing, and better logging is appropriate in any case (and the later patch will likely require an ABI bump, so should be separate anyway).

github ref: ​https://github.com/garybuhrmaster/mythtv/commit/b6f41381a9a7017fda4ec7b66cbe006bc282879d github git-am ref: ​https://github.com/garybuhrmaster/mythtv/commit/b6f41381a9a7017fda4ec7b66cbe006bc282879d.patch

[Gary Buhrmaster <gary.buhrmaster@…>]

In f4634d2ea524baf2e7c2d99995b7b565e635cd07/mythtv:

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[Gary Buhrmaster <gary.buhrmaster@…>]

In aad702d8e0e1cd5d04241bedc5477380f06167f4/mythtv:

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