Don't report spurious netlink errors.

CHANGELOG

@@ -13,6 +13,9 @@ version 2.64
 	    Fix broken vendor-option processing for BOOTP. Thanks to
 	    Hans-Joachim Baader for the bug report.
 
+	    Don't report spurious netlink errors, regression in
+	    2.63. Thanks to Vladislav Grishenko for the patch.
+
 
 version 2.63
             Do duplicate dhcp-host address check in --test mode.

src/netlink.c

@@ -336,7 +336,8 @@ static int nl_async(struct nlmsghdr *h)
   if (h->nlmsg_type == NLMSG_ERROR)
     {
       struct nlmsgerr *err = NLMSG_DATA(h);
-      my_syslog(LOG_ERR, _("netlink returns error: %s"), strerror(-(err->error)));
+      if (err->error != 0)
+	my_syslog(LOG_ERR, _("netlink returns error: %s"), strerror(-(err->error)));
       return 0;
     }
   else if (h->nlmsg_pid == 0 && h->nlmsg_type == RTM_NEWROUTE)