rootfs: Avoid unnecessarily restarting rsyslog

When the DHCP lease is renewed, if the specified log servers are the
same as the previous lease, there is no reason to regenerate the
*rsyslog* configuration file and restart the service.

rootfs/overlay/usr/lib/dhcpcd/dhcpcd-hooks/60-syslog

@@ -12,10 +12,13 @@ gen_action() {
 changed=false
 if [ -n "${interface}" ] && [ -d /run/rsyslog.d ]; then
     if [ -n "${new_log_servers}" ]; then
-        echo '# Generated by dhcpcd' > /run/rsyslog.d/dhcpcd."${interface}".conf
+        if [ "${new_log_servers}" != "${old_log_servers}" ]; then
+            echo '# Generated by dhcpcd' \
+                > /run/rsyslog.d/dhcpcd."${interface}".conf
             for s in ${new_log_servers}; do
                 gen_action "${s}" >> /run/rsyslog.d/dhcpcd."${interface}".conf
             done
+        fi
         changed=true
     elif [ -n "${old_log_servers}" ]; then
         rm -f /run/rsyslog.d/dhcpcd."${interface}".conf