fix array index overflow in set_at_pointer - #1192

fix array index overflow in set_at_pointer#1192

Ramya-9353 wants to merge 2 commits into

boostorg:developboostorg/json:developfrom

Ramya-9353:pointer-set-index-overflowRamya-9353/json:pointer-set-index-overflowCopy head branch name to clipboard