drm/sti: Fix return type of sti_{dvo,hda,hdmi}connectormode_valid()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v6.0.16 by commit e578b0906b6a81479cd5b5b6c848a7096addf5e9. For more details please see the references link.