[Rpm-maint] [rpm-software-management/rpm] Drop slen from builtin macro parser function (#839)

[Michael Schroeder]

The calculation of the slen parameter was not correct, as it didn't
account for already processed characters. The parameter itself was
also not used to limit the passed string, as the code assumed zero
termination. Thus we can as well simplify the code by using strlen()
on the passed string.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/839

-- Commit Summary --

  * Drop slen from builtin macro parser function

-- File Changes --

    M rpmio/macro.c (36)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/839.patch
https://github.com/rpm-software-management/rpm/pull/839.diff

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