[oe] How to fix OE missing checksum error for some rt2570-k2wrlz recipe

[Elvis Dowson]

Hi,
	I am getting a missing checksum error.

NOTE: Running task 358 of 558 (ID: 2, /tool/overo-oe/user.collection/ 
recipes/rt2x00/rt2570-k2wrlz_1.6.4.bb, do_fetch)
NOTE: Missing checksum
ERROR: rt2570-k2wrlz-1.6.4: http://homepages.tu-darmstadt.de/~p_larbig/wlan/rt2570-k2wrlz-1.6.4.tar.bz2 
  has no entry in conf/checksums.ini, not checking URI
ERROR: Error in executing: /tool/overo-oe/user.collection/recipes/ 
rt2x00/rt2570-k2wrlz_1.6.4.bb

I realize I can get past this error by setting  
OE_ALLOW_INSECURE_DOWNLOADS="1", but how can I fix things so I don't  
have to disable this check just to get past the OE build error and  
properly check the checksum?

Here is the contents of my bitbake recipe:

File: rt2570-k2wrlz_1.6.4.bb
--------------------------------------

DESCRIPTION = "Enhanced Driver for Ralink rt2570 USB 802.11g WiFi  
sticks"
HOMEPAGE = "http://homepages.tu-darmstadt.de/~p_larbig/wlan"
SECTION = "kernel/modules"
LICENSE = "GPL"

PR = "r1"

SRC_URI = "http://homepages.tu-darmstadt.de/~p_larbig/wlan/${PN}-$ 
{PV}.tar.bz2"

inherit module

S = "${WORKDIR}/${PN}-${PV}/Module/"

do_compile_prepend_arm () {
MAKE_TARGETS="arm"
}

do_compile() {
export KERNDIR=${STAGING_KERNEL_DIR}
module_do_compile
}

do_install() {
	install -d ${D}${base_libdir}/modules/${KERNEL_VERSION}/extra
	install -m 0644 rt2570${KERNEL_OBJECT_SUFFIX} ${D}${base_libdir}/ 
modules/${KERNEL_VERSION}/extra/
}


Best regards,

Elvis