Merge pull request #27366 from ifed01/wip-ifed-fix-alloc-overflow-mimic

mimic: os/bluestore: fix length overflow.

Reviewed-by: Jianpeng Ma <jianpeng.ma@intel.com>
Reviewed-by: Neha Ojha <nojha@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>

diff --cc src/os/bluestore/fastbmap_allocator_impl.h
Simple merge