[Rpm-maint] [rpm-software-management/rpm] Harden against crafted inputs (#1471)

[lgtm-com[bot]]

This pull request **introduces 1 alert** when merging 71842ad20cccadd907f7a345d2101c203a97490c into 5ce2b5e3121aa07eb1ccf2bc24443c1536bf94d5 - [view on LGTM.com](https://lgtm.com/projects/g/rpm-software-management/rpm/rev/pr-09a8b39359d616c6e625afffb647f96d79c4f7a5)

**new alerts:**

* 1 for Dead code due to goto or break statement

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