rc.daily missing diff markers

In the output from the daily insecurity report run, the sections on
setuid and block device changes are missing any diff markup. The
remaining sections are fine.

From this morning's post-7.1-upgrade run:

Setuid changes:
-r-sr-xr-x 2 root bin 355952 Sep 30 13:01:03 2021 /sbin/ping
-r-sr-xr-x 2 root bin 358736 Apr 11 16:46:17 2022 /sbin/ping
-r-sr-xr-x 2 root bin 355952 Sep 30 13:01:03 2021 /sbin/ping6
-r-sr-xr-x 2 root bin 358736 Apr 11 16:46:17 2022 /sbin/ping6
-r-sr-x--- 1 root operator 274936 Sep 30 13:01:04 2021 /sbin/shutdown
-r-sr-x--- 1 root operator 277592 Apr 11 16:46:17 2022 /sbin/shutdown
[...]


Block device changes:
brw-r----- 1 root operator 6, 0 Mar 4 14:48:06 2022 /dev/cd0a
brw-r----- 1 root operator 6, 0 Apr 21 12:19:45 2022 /dev/cd0a
brw-r----- 1 root operator 6, 2 Mar 4 14:48:06 2022 /dev/cd0c
brw-r----- 1 root operator 6, 2 Apr 21 12:19:45 2022 /dev/cd0c
brw-r----- 1 root operator 6, 16 Mar 4 14:48:01 2022 /dev/cd1a
brw-r----- 1 root operator 6, 16 Apr 21 12:19:40 2022 /dev/cd1a
[...]