amdgpu_vf_error: signed int ring counters used as modulo array indices — 2^31 wrap is signed-overflow UB and produces negative array-index writes (contained inside amdgpu_vf_error_buffer)

Summary

read_count/write_count are signed int (amdgpu_virt.h:44-45) used as %16 subscripts (vf_error.c:42-46,76): after 2^31 puts the increment overflows (UB) and negative remainder writes code[index]/flags[index]/data[index] at [-15,-1] - mis-writes stay inside the embedding struct (worst case lk_flags/lk_wmesg of the live lockmgr). Reaching wrap needs 2^31 genuine SR-IOV VF failure events (months); both fns no-op outside VF mode; amdgpu module-only. uint32_t counter fix.