Memory leak in idl_create_annotation_appl

[reicheratwork]

Memory assigned during the call to idl_create_annotation_appl is not collected properly in the case when the parameter is a scoped name and idl_resolve cannot resolve it correctly.

Example code to reproduce issue:

idl_pstate_t *pstate = NULL;
idl_retcode_t ret = parse_string(IDL_FLAG_ANNOTATIONS, "@value(e_0) enum e { e_0, e_1 };", &pstate);

if (pstate)
  idl_delete_pstate(pstate);

[reicheratwork]

Until this issue is fixed, the last subtest in the test case annotation.c: idl_annotation::idl_default added in #919 is commented out as it triggers this issue.

When this bug is fixed, the test is to be uncommented.