logcat: fix logpersist.stop and logpersist.clear

    echo "WARNING: Can not use --size or --buffer with ${progname%.*}.stop" >&2

  fi

  if [ "true" = "${clear}" ]; then

    setprop ${property} "clear"

    setprop ${property#persist.} "clear"

  else

    setprop ${property} "stop"

    setprop ${property#persist.} "stop"

  fi

  if [ -n "`getprop ${property#persist.}.buffer`" ]; then

    setprop ${property}.buffer ""