Disable inadyn logging

src/freedombone

@@ -10654,6 +10654,7 @@ function install_dynamicdns {
   echo 'period         300' >> /etc/inadyn.conf
   echo 'startup-delay  60' >> /etc/inadyn.conf
   echo 'cache-dir      /run/inadyn' >> /etc/inadyn.conf
+  echo 'logfile        /dev/null' >> /etc/inadyn.conf
   chmod 600 /etc/inadyn.conf
 
   echo '[Unit]' > /etc/systemd/system/inadyn.service