CVE-2024-46730 — drm/amd/display: Ensure array index tg_inst won't be -1

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Ensure array index tg_inst won't be -1

[WHY & HOW] tg_inst will be a negative if timing_generator_count equals 0, which should be checked before used.

This fixes 2 OVERRUN issues reported by Coverity.

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