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tmpfiles attempts to correct the label of a file during various actions via the function fd_set_perms(). Currently, said function generally respects the dry-run mode. However, it attempts to fix the label of a given file regardless of the state of said dry-run mode. This causes problems, because a user could attempt to run tmpfiles with elevated permissions and dry run enabled, expecting the tool to not modify their system. Instead, tmpfiles would falsely relabel a file, modifying their system. This commit explicitly checks for when dry-run is enabled and skips the file relabelling process. Furthermore, I added logging for both cases. I found helpful during debugging. That said, I don't think it's necessary to use the level LOG_INFO on the dry-run path, as it would always produce an info log.