xfrm6: check ip6_dst_idev() return value in xfrm6_get_saddr()

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                        "net/ipv6/xfrm6_policy.c"
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv6/xfrm6_policy.c"
                    ],
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                        {
                            "version": "2.6.12",
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                            "lessThanOrEqual": "*",
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                            "versionType": "original_commit_for_fix"
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                }