Free the string before converting to a key.

[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from CCSGNOMEIntegrationTestReadIntegrated
[ RUN      ] CCSGNOMEIntegrationTestReadIntegrated.TestReadInKeyOption
[       OK ] CCSGNOMEIntegrationTestReadIntegrated.TestReadInKeyOption (497 ms)
[----------] 1 test from CCSGNOMEIntegrationTestReadIntegrated (508 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (545 ms total)
[  PASSED  ] 1 test.
==28512== 
==28512== HEAP SUMMARY:
==28512==     in use at exit: 0 bytes in 0 blocks
==28512==   total heap usage: 1,200 allocs, 1,200 frees, 144,800 bytes allocated
==28512== 
==28512== All heap blocks were freed -- no leaks are possible
==28512== 
==28512== For counts of detected and suppressed errors, rerun with: -v
==28512== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)