CVE-2022-49723 drm/i915/reset: Fix error_state_read ptr + offset use

In the Linux kernel, the following vulnerability has been resolved: drm/i915/reset: Fix errorstateread ptr + offset use Fix our pointer offset usage in errorstateread when there is no i915gpucoredump but buf offset is non-zero. This fixes a kernel page fault can happen when multiple tests are...