Caller of the controlfd_init_ifsun() expects errno to be set on failure, so set it in case we fail due to provided socket name too long.
Caller of the controlfd_init_ifsun() expects errno to be set on
failure, so set it in case we fail due to provided socket name
too long.

dsanders11/rtpproxy,sippy/rtpproxy,dsanders11/rtpproxy,sippy/rtpproxy,sippy/rtpproxy,dsanders11/rtpproxy