When connect() fails in connect_unix() the path_ctx.fd is not
set to -1 after close(). When common_release() is executed due
to the error return from connect_unix() it calls close() a second
time.
There is no need to call close() from connect_unix(). Remove the
duplicate request.
This issue was reported by YASUOKA Masahiko.
Change-Id: I825e274cc7f12e50a8779a2b62ddb756817cdb52