Don't compute with octal numbers

The random number could have leading 0, which meant octal, but then
there could be 8 or 9, which would confuse the follow-up arithmetics.

Fixes #2769.

logsend/logsend.sh

@@ -16,7 +16,7 @@ trap 'rm -f "$TMPFILE" "$BUFFER"' EXIT ABRT QUIT TERM
 # Don't load the server all at once. With NTP-synchronized time, and
 # thousand clients, it would make spikes on the CPU graph and that's not
 # nice.
-sleep $(( $(tr -cd 0-9 </dev/urandom | head -c 8) % 120 ))
+sleep $(( $(tr -cd 0-9 </dev/urandom | head -c 8 | sed -e 's/^0*//' ) % 120 ))
 
 cp /tmp/logs.last.sha1 "$TMPFILE" || true
 # Grep regexp: Month date time hostname daemon