Merge pull request #62894 from rzarzynski/wip-crimson-unused-errors

crimson: fix unused variable warnings due to assert() and NDEBUG builds

Reviewed-by: Ronen Friedman <rfriedma@redhat.com>
Reviewed-by: Yingxin Cheng <yingxin.cheng@intel.com>

diff --cc src/crimson/os/seastore/btree/fixed_kv_btree.h
Simple merge

diff --cc src/crimson/osd/pg_recovery.cc
Simple merge