modules: fix error when connecting with IPv6-only #508

Job	Run time
generate_target_matrix	3s
build_firmware (ath79-generic)	1h 17m 59s
build_firmware (ath79-mikrotik)	1h 11m 9s
build_firmware (ath79-nand)	1h 10m 0s
build_firmware (bcm27xx-bcm2708)	1h 5m 27s
build_firmware (bcm27xx-bcm2709)	1h 12m 38s
build_firmware (bcm27xx-bcm2710)	1h 17m 38s
build_firmware (bcm27xx-bcm2711)	1h 16m 22s
build_firmware (ipq40xx-generic)	1h 7m 54s
build_firmware (ipq40xx-mikrotik)	1h 12m 31s
build_firmware (ipq806x-generic)	1h 11m 45s
build_firmware (lantiq-xrx200)	1h 14m 51s
build_firmware (lantiq-xway)	1h 11m 3s
build_firmware (mediatek-mt7622)	1h 17m 27s
build_firmware (mpc85xx-p1010)	1h 9m 36s
build_firmware (mpc85xx-p1020)	1h 10m 48s
build_firmware (mvebu-cortexa9)	1h 10m 10s
build_firmware (ramips-mt7620)	1h 10m 15s
build_firmware (ramips-mt7621)	1h 14m 7s
build_firmware (ramips-mt76x8)	1h 11m 32s
build_firmware (realtek-rtl838x)	1h 1m 32s
build_firmware (rockchip-armv8)	1h 18m 3s
build_firmware (sunxi-cortexa7)	1h 6m 2s
build_firmware (x86-64)	1h 23m 47s
build_firmware (x86-generic)	1h 17m 53s
build_firmware (x86-geode)	1h 15m 48s
build_firmware (x86-legacy)	1h 15m 58s
create_release	0s
	1d 7h 32m 18s

Provide feedback