[Rpm-maint] [rpm-software-management/rpm] Close file on all paths to prevent resource leak (PR #3930)

[Piotr Idzik]

vil02 left a comment (rpm-software-management/rpm#3930)

> How did you stumble over this?

There was no magic: cppcheck was reporting `resourceLeak`. The exact output looked like:
```
$ cppcheck tests/rpmpgppubkeyfingerprint.c
Checking tests/rpmpgppubkeyfingerprint.c ...
tests/rpmpgppubkeyfingerprint.c:45:2: error: Resource leak: f [resourceLeak]
 return 1;
 ^
tests/rpmpgppubkeyfingerprint.c:54:2: error: Resource leak: f [resourceLeak]
 return 1;
 ^
tests/rpmpgppubkeyfingerprint.c:64:6: error: Resource leak: f [resourceLeak]
     return 0;
     ^
tests/rpmpgppubkeyfingerprint.c:67:2: error: Resource leak: f [resourceLeak]
 return 1;
 ^
tests/rpmpgppubkeyfingerprint.c:74:2: error: Resource leak: f [resourceLeak]
 return 1;
 ^
tests/rpmpgppubkeyfingerprint.c:81:2: error: Resource leak: f [resourceLeak]
 return 1;
 ^
tests/rpmpgppubkeyfingerprint.c:86:5: error: Resource leak: f [resourceLeak]
    return 0;
    ^
```

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