Since sd_listen_fds() doesn't set errno when returning a value > 1,
it doesn't make sense to use pr_perror(). Use pr_err() instead.

While at it, remove the period from the log message.

[v2: fix function names]
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>