CVE-2024-56778 drm/sti: avoid potential dereference of error pointers in sti_hqvdp_atomic_check

In the Linux kernel, the following vulnerability has been resolved: drm/sti: avoid potential dereference of error pointers in stihqvdpatomiccheck The return value of drmatomicgetcrtcstate needs to be checked. To avoid use of error pointer 'crtcstate' in case of the failure...