[Rpm-maint] [rpm-software-management/rpm] Fix double-free on ternary operator parsing error (#847)

[Michael Schroeder]

I think we just need a
```
exprErr(state, _("syntax error in expression"), state->p);
```
in doPrimary()'s default case to fix missing error for `%{expr:0 < 1 ? 4+ : 0}`.

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