CVE-2023-52773 drm/amd/display: fix a NULL pointer dereference in amdgpu_dm_i2c_xfer()

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix a NULL pointer dereference in amdgpudmi2cxfer When ddcserviceconstruct is called, it explicitly checks both the link type and whether there is something on the link which will dictate whether the pin is marke...