[Rpm-maint] [rpm-software-management/rpm] Reduce undefined pointer arithmetic (#1710)

[Demi Marie Obenour]

This is mostly for the benefit of fuzzers and other automated tools, and
for compilers other than GCC.  On modern versions of GCC with
-fno-strict-overflow, this is harmless.

If such patches are not desired, feel free to close this PR.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1710

-- Commit Summary --

  * Reduce undefined pointer arithmetic

-- File Changes --

    M rpmio/rpmpgp.c (4)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1710.patch
https://github.com/rpm-software-management/rpm/pull/1710.diff

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