[Rpm-maint] [rpm-software-management/rpm] Fix possible NULL pointer dereference in rpmfcClassify (PR #1873)

[Dmitry Gerasimov]

Here is simplified overview of possible dereference:

```cpp
    if (fc == NULL) {
        rpmlog(RPMLOG_ERR, _("Empty file classifier\n"));
        goto exit;
    }

    // ...

exit:
    rpmstrPoolFreeze(fc->cdict, 0);
                     ~~~~~~~~~
```

This issue was found by Svace Static Analyzer.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1873

-- Commit Summary --

  * Fix possible NULL pointer dereference in rpmfcClassify

-- File Changes --

    M build/rpmfc.c (2)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1873.patch
https://github.com/rpm-software-management/rpm/pull/1873.diff

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