CVE-2025-68283 libceph: replace BUG_ON with bounds check for map->max_osd

In the Linux kernel, the following vulnerability has been resolved: libceph: replace BUGON with bounds check for map-maxosd OSD indexes come from untrusted network packets. Boundary checks are added to validate these against map-maxosd. idryomov: drop BUGON in cephgetprimaryaffinity, minor cosmet...