obj: recalculate curr_allocated on underflow - 2nd#38

janekmi merged 2 commits intostable-2.1daos-stack/pmdk:stable-2.1from

grom72/DAOS-18882-util_atomic_store_explicit64daos-stack/pmdk:grom72/DAOS-18882-util_atomic_store_explicit64Copy head branch name to clipboard