ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()

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                        "net/ipv6/ioam6.c",
                        "net/ipv6/ioam6_iptunnel.c"
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                        "include/net/ioam6.h",
                        "net/ipv6/exthdrs.c",
                        "net/ipv6/ioam6.c",
                        "net/ipv6/ioam6_iptunnel.c"
                    ],
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