CVE-2026-74417 drm/radeon: fix integer overflow in radeon_align_pitch()

In the Linux kernel, the following vulnerability has been resolved: drm/radeon: fix integer overflow in radeonalignpitch radeonalignpitch has the same kind of overflow issue as the old amdgpu helper: both the alignment round-up add and the final 'aligned cpp' calculation can overflow signed int. ...