ieee802154: 6lowpan: only accept IPv6 packets in lowpan_xmit()

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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ieee802154/6lowpan/tx.c"
                    ],
                    "versions": [
                        {
                            "version": "4.0",
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                        },
                        {
                            "version": "0",
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                            "versionType": "original_commit_for_fix"
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                }