Plug a memory leak.
Addressing:
 35 bytes in 1 blocks are definitely lost in loss record 2 of 3
    at 0x4A0645D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
    by 0x4C58B38: __oscap_alloc (alloc.c:52)
    by 0x4C9688C: cpe_name_get_as_format (cpename.c:670)
    by 0x4C97F3B: cpe_testexpr_export (cpelang_priv.c:571)
    by 0x4C98047: cpe_testexpr_export (cpelang_priv.c:603)
    by 0x4C9811B: cpe_platform_export (cpelang_priv.c:556)
    by 0x4C981B7: cpe_lang_export (cpelang_priv.c:538)
    by 0x4C9FF8A: xccdf_benchmark_to_dom (benchmark.c:303)
    by 0x4CA0246: xccdf_benchmark_export (benchmark.c:236)
    by 0x4CB2CE5: xccdf_session_export_xccdf (xccdf_session.c:998)
    by 0x40B9D9: app_evaluate_xccdf (oscap-xccdf.c:508)
    by 0x4079BF: oscap_module_process (oscap-tool.c:261)