[io] Protect out-of-bounds access in R__WriteDestructorBody:#5642

Axel-Naumann merged 1 commit intoroot-project:masterroot-project/root:masterfrom

Axel-Naumann:TStreamerInfoWriteDtorBody-MemErrorAxel-Naumann/root:TStreamerInfoWriteDtorBody-MemErrorCopy head branch name to clipboard