tracing: Fix reading strings from synthetic events

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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/trace/trace_events_synth.c"
                    ],
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                            "version": "5.10",
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                            "version": "0",
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                        {
                            "version": "5.15.75",
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                        {
                            "version": "5.19.17",
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                            "version": "6.0.3",
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