Show none in fw_update when none are detected

[Andrew Hewus Fresh]

In the case where no firmware are detected/installed fw_update is too
quiet.

This should fix things to show "none" in that case:

    # fw_update
    fw_update: added none; updated none; kept none

Is that what folks would expect?

This patch does not include the extra level of indentation that will
result, but that would obfuscate the change.

Comments, OK?

Index: usr.sbin/fw_update/fw_update.sh
===================================================================
RCS file: /cvs/src/usr.sbin/fw_update/fw_update.sh,v
retrieving revision 1.39
diff -u -p -r1.39 fw_update.sh
--- usr.sbin/fw_update/fw_update.sh     19 Feb 2022 02:19:42 -0000      1.39
+++ usr.sbin/fw_update/fw_update.sh     19 Feb 2022 19:54:24 -0000
@@ -492,14 +492,13 @@ else
            { [ "${devices[*]:-}" ] && echo " found." || echo " done." ; }
 fi
 
-[ "${devices[*]:-}" ] || exit
-
-lock_db
 
 added=''
 updated=''
 kept=''
 unregister=''
+if [ "${devices[*]:-}" ]; then
+lock_db
 for f in "${devices[@]}"; do
        d="$( firmware_devicename "$f" )"
 
@@ -609,6 +608,7 @@ for f in "${devices[@]}"; do
                updated="$updated,$d"
        fi
 done
+fi
 
 added="${added:#,}"
 updated="${updated:#,}"