fixes these warnings:
> ../src/main.c: In function 'capture_completed':
> ../src/main.c:321:9: error: format not a string literal and no format arguments -Werror=format-security
> 321 | snprintf(last_path, sizeof(last_path), args->fname);
> | ^~~~~~~~
> ../src/process_pipeline.c: In function 'setup_capture':
> ../src/process_pipeline.c:165:9: error: format not a string literal and no format arguments [-Werror=format-security]
> 165 | snprintf(burst_dir, sizeof(burst_dir), tempdir);
> | ^~~~~~~~
otherwise, `args->fname` and `tempdir` themself would be interpreted
as the specifier.
Colin
cf2553033f