[Rpm-maint] [rpm-software-management/rpm] Fix undefined pointer comparison (#1603)

[Demi Marie Obenour]

This was detected by building with GCC’s `-fsanitize=address,pointer-compare`
and running with `ASAN_OPTIONS=detect_invalid_pointer_pairs=1`.

Fixes #1602
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1603

-- Commit Summary --

  * Fix undefined pointer comparison

-- File Changes --

    M rpmio/macro.c (20)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1603.patch
https://github.com/rpm-software-management/rpm/pull/1603.diff

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