[Rpm-maint] [rpm-software-management/rpm] rpmio: avoid reading past the end of the mode string (#1604)

[Demi Marie Obenour]

This was found by running the testsuite under `-fsanitize=address`.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1604

-- Commit Summary --

  * rpmio: avoid reading past the end of the mode string

-- File Changes --

    M rpmio/rpmio.c (2)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1604.patch
https://github.com/rpm-software-management/rpm/pull/1604.diff

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