Plug a memory leak.

Addressing:
48 bytes in 3 blocks are definitely lost in loss record 2 of 4
    at 0x4A0645D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
    by 0x31F78AE548: xmlStrndup (in /usr/lib64/libxml2.so.2.9.1)
    by 0x31F78EBB8C: xmlTextReaderGetAttribute (in /usr/lib64/libxml2.so.2.9.1)
    by 0x4C9BA9A: cpe23_item_parse (cpedict_ext_priv.c:129)
    by 0x4C9B08C: cpe_item_parse (cpedict_priv.c:840)
    by 0x4C9B2E2: cpe_dict_model_parse (cpedict_priv.c:646)
    by 0x4C9B4B9: cpe_dict_model_parse_xml (cpedict_priv.c:580)
    by 0x4C955E2: cpe_dict_model_import (cpedict.c:56)
    by 0x40CBE1: app_info (oscap-info.c:220)
    by 0x4079BF: oscap_module_process (oscap-tool.c:261)
    by 0x4069BE: main (oscap.c:79)
Plug a memory leak.

Addressing:
 148 bytes in 3 blocks are definitely lost in loss record 3 of 4
    at 0x4A0645D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
    by 0x31F78AE548: xmlStrndup (in /usr/lib64/libxml2.so.2.9.1)
    by 0x31F78EBB8C: xmlTextReaderGetAttribute (in /usr/lib64/libxml2.so.2.9.1)
    by 0x4C9BA87: cpe23_item_parse (cpedict_ext_priv.c:128)
    by 0x4C9B08C: cpe_item_parse (cpedict_priv.c:840)
    by 0x4C9B2E2: cpe_dict_model_parse (cpedict_priv.c:646)
    by 0x4C9B4B9: cpe_dict_model_parse_xml (cpedict_priv.c:580)
    by 0x4C955E2: cpe_dict_model_import (cpedict.c:56)
    by 0x40CBE1: app_info (oscap-info.c:220)
    by 0x4079BF: oscap_module_process (oscap-tool.c:261)
    by 0x4069BE: main (oscap.c:79)
Plug a memory leak.

Addressing:
 379 bytes in 7 blocks are definitely lost in loss record 4 of 4
    at 0x4A0645D: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
    by 0x31F78AE548: xmlStrndup (in /usr/lib64/libxml2.so.2.9.1)
    by 0x31F78EBB8C: xmlTextReaderGetAttribute (in /usr/lib64/libxml2.so.2.9.1)
    by 0x4C9B86A: cpe23_item_parse (cpedict_ext_priv.c:244)
    by 0x4C9B08C: cpe_item_parse (cpedict_priv.c:840)
    by 0x4C9B2E2: cpe_dict_model_parse (cpedict_priv.c:646)
    by 0x4C9B4B9: cpe_dict_model_parse_xml (cpedict_priv.c:580)
    by 0x4C955E2: cpe_dict_model_import (cpedict.c:56)
    by 0x40CBE1: app_info (oscap-info.c:220)
    by 0x4079BF: oscap_module_process (oscap-tool.c:261)
    by 0x4069BE: main (oscap.c:79)
Merge branch 'maint-1.0' of github.com:jan-cerny/openscap into maint-1.0