CVE-2024-46730

[Support]

CVE-2024-46730
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.