Fixed memory leak for clib-search

[WestleyR]

Frees all pointers from strdup.

Before:

$ clib-search foo
[...]
Process 71040: 1070 nodes malloced for 55 KB
Process 71040: 562 leaks for 19648 total leaked bytes.

    562 (19.2K) << TOTAL >>

Yup, almost a whopping 20Kbs of leaked memory.

After:

$ clib-search foo
[...]
Process 71043: 508 nodes malloced for 36 KB
Process 71043: 0 leaks for 0 total leaked bytes.

And now, there is no leaks!