sysmocom-archiver: Attempt to fix issue with linux-firmware

Exception: OSError: [Errno 36] File name too long: '/home/oebuilds/jenkins/workspace/Yocto-Master/label/OE/build/tmp/deploy/sources/allarch-poky-linux/Firmware-AbilisFirmware-agereFirmware-amd-ucodeFirmware-atheros_firmwareFirmware-broadcom_bcm43xxFirmware-ca0132Firmware-chelsio_firmwareFirmware-cw1200Firmware-dib0700Firmware-ene_firmwareFirmware-fw_sst_0f28Firmware-go7007Firmware-i2400mFirmware-ibt_firmwareFirmware-it913xFirmware-iwlwifi_firmwareFirmware-IntcSST2Firmware-MarvellFirmware-mwl8335Firmware-myri10ge_firmwareFirmware-OLPCFirmware-phanfwFirmware-qat_dh895xcc_firmwareFirmware-qla2xxxFirmware-r8a779x_usb3Firmware-radeonFirmware-ralink_a_mediatek_company_firmwareFirmware-ralink-firmwareFirmware-rtlwifi_firmwareFirmware-tda7706-firmwareFirmware-ti-connectivityFirmware-ueagle-atm4-firmwareFirmware-via_vt6656Firmware-wl1251Firmware-xc4000Firmware-xc5000Firmware-xc5000cFirmware-sianoFirmware-qualcommAthos_ar3kFirmware-qualcommAthos_ath10k'

classes/sysmocom-archiver.bbclass

@@ -250,7 +250,9 @@ def get_licenses(d):
                         clean_licenses += x
         if '|' in clean_licenses:
                 clean_licenses = clean_licenses.replace('|','')
-        return clean_licenses
+        # linux-firmware has many many licenses, leading to too long path
+        # so let's truncate it at 200...
+        return clean_licenses[0:200]
 
 def move_tarball_deploy(d,tarball_list):
     '''move tarball in location to ${DEPLOY_DIR}/sources'''