[Rpm-maint] [rpm-software-management/rpm] Use xcalloc() instead of open-coded arithmetic (PR #1900)

[Panu Matilainen]

calloc() is significantly more expensive than malloc(), and these happen for every single package for non-trivial quantities of memory. A far subtler and generally useful hammer would be introducing + using a malloc() variant that takes calloc()-style arguments (similar to glibc reallocarray()) and failure semantics. There are some 160 malloc call-sites in rpm, and large number of them are performing arithmetics for the allocation size...


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