Fix SourceAv in function 'flatbuffers::ReadScalar' (#21029)

[rascani]

Summary: Pull Request resolved: #21029

Reviewed By: rascani

Differential Revision: D112525269

[pytorch-bot]

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[meta-codesync]

@rascani has exported this pull request. If you are a Meta employee, you can view the originating Diff in D112525269.

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