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nlplug-findfs: clean up netlink socket

we set CLOEXEC with socket create

--- a/nlplug-findfs.c

+++ b/nlplug-findfs.c

@@ -6,6 +6,10 @@

  * Copyright (c) 2015 Natanael Copa <ncopa@alpinelinux.org>

  */

+#ifndef _GNU_SOURCE

+#define _GNU_SOURCE

+#endif

+

 #include <dirent.h>

 #include <err.h>

 #include <errno.h>

@@ -121,7 +125,8 @@

 	nls.nl_pid = getpid();

 	nls.nl_groups = -1;

-	fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);

+	fd = socket(PF_NETLINK, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC,

+		    NETLINK_KOBJECT_UEVENT);

 	if (fd < 0)

 		err(1, "socket");

@@ -141,7 +146,6 @@

 	if (bind(fd, (void *)&nls, sizeof(nls)))

 		err(1, "bind");

-	fcntl(fd, F_SETFD, FD_CLOEXEC);

 	return fd;

 }