B.42. libnl

Some nl_send_auto_complete() callers did not free the allocated message when errors were reported, resulting in libnl leaking memory. A problem in its own right, these small leaks also made it more work to detect memory leaks in other processes. With this update, allocated messages are freed correctly when nl_send_auto_complete() is called, and libnl no longer leaks memory in this circumstance.