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

[Michael Schroeder]

The duplicate error is because rpmExprStr/rpmExprBool ignore the return value of the
`rdToken()` call. That should also be fixed.

It's not really about TOK_TERNARY_ALT, you'll get the same error with `%{expr:4 * +}`

If the different error message bothers you, just delete the TOK_EOF case so that you'll
also get a syntax error if the expression ends unexpectedly.

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