luzer: fix memory leak in FDP #66
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When luzer runs a test with broken dictionary it runs `LLVMFuzzerRunDriver()` that prints an error message: ParseDictionaryFile: error in line 1 "\\200\\000" # Uses: 283 the it frees argv[] and returns. A function `free_argv()` frees argv[] again and we observe a segmentation fault. The problem was fixed by the previous commit. The patch adds an additional test for the problem. Follows up #52 Closes #65
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Fixes #52