libelftc: Add a missing check for an error from vector_str_init(). While here consistently use the same spelling for such checks. CID: 1376769 MFC after: 1 week Sponsored by: The FreeBSD Foundation
libelftc: Fix memory leaks in the C++ demanglers. CID: 1262518, 1262519, 1262520, 1262529 MFC after: 1 week Sponsored by: The FreeBSD Foundation