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Make fetching the DMI uuid fail silently

This flag does not exist on most non-x86 platforms.

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -519,7 +519,7 @@

 	fi

 elif is_url "$KOPT_apkovl"; then

 	# Fetch apkovl via network

-	MACHINE_UUID=$(cat /sys/class/dmi/id/product_uuid)

+	MACHINE_UUID=$(cat /sys/class/dmi/id/product_uuid 2>/dev/null)

 	url="${KOPT_apkovl/{MAC\}/$MAC_ADDRESS}"

 	url="${url/{UUID\}/$MACHINE_UUID}"

 	ovl=/tmp/${url##*/}