ART 1.23 on Windows crashes when embedded metadata selected in Samsung DNG

[Len Philpot]

When a DNG from a Samsung S23 FE is loaded, select Raw tab | Flat Field | Embedded in metadata and ART will crash. Confirmed in both the stable and @gaaned92’s optimized Windows builds.

Sample DNG and sidecar are attached.

Thanks.

[Len Philpot]

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[agriggio]

do proper bounds checking when applying gain maps

Fixes #331

→ <<cset 01c652476c4b>>