We can't really use conf_files_list() for finding type #1 entries, since it is case-sensitive, but type #1 entries are typically placed on VFAT, i.e. are case-insensitive. hence, use readdir_all() instead, which is quite similar, but gives us all files, and allows us to do a case-insensitive check. While we are at it, use openat() on the open dir to open the file, and pass that around, to make things a tiny bit more race-free.
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