Previously the MMapCache* was optionally NULL, which open would handle by creating a new MMapCache* for the occasion. This produced some slightly circuitous refcount-handling code in the function, as well as arguably creating opportunities for weirdness where an MMapCache* was intended to be supplied but happened to be NULL, which this magic would then paper over. In any case, this was basically only being utilized by tests, apparently just to avoid having to create an MMapCache. So update the relevant tests to supply an MMapCache and make journal_file_open() treat a NULL MMapCache* as fatal w/assert.
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