Add SPDX identifiers

Software Package Data Exchange identifiers help to detect source file
licenses and hence simplify the FOSS compliance process.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>

https://github.com/thom311/libnl/pull/219

---

FILES=(
  lib/addr.c
  lib/attr.c
  lib/cache.c
  lib/cache_mngr.c
  lib/cache_mngt.c
  lib/data.c
  lib/error.c
  lib/fib_lookup/lookup.c
  lib/fib_lookup/request.c
  lib/genl/ctrl.c
  lib/genl/family.c
  lib/genl/genl.c
  lib/genl/mngt.c
  lib/handlers.c
  lib/hash.c
  lib/hashtable.c
  lib/idiag/idiag.c
  lib/idiag/idiag_meminfo_obj.c
  lib/idiag/idiag_msg_obj.c
  lib/idiag/idiag_req_obj.c
  lib/idiag/idiag_vegasinfo_obj.c
  lib/mpls.c
  lib/msg.c
  lib/netfilter/ct.c
  lib/netfilter/ct_obj.c
  lib/netfilter/exp.c
  lib/netfilter/exp_obj.c
  lib/netfilter/log.c
  lib/netfilter/log_msg.c
  lib/netfilter/log_msg_obj.c
  lib/netfilter/log_obj.c
  lib/netfilter/netfilter.c
  lib/netfilter/nfnl.c
  lib/netfilter/queue.c
  lib/netfilter/queue_msg.c
  lib/netfilter/queue_msg_obj.c
  lib/netfilter/queue_obj.c
  lib/nl.c
  lib/object.c
  lib/route/act.c
  lib/route/addr.c
  lib/route/class.c
  lib/route/classid.c
  lib/route/cls.c
  lib/route/link.c
  lib/route/neigh.c
  lib/route/neightbl.c
  lib/route/netconf.c
  lib/route/nexthop.c
  lib/route/nexthop_encap.c
  lib/route/nh_encap_mpls.c
  lib/route/pktloc.c
  lib/route/qdisc.c
  lib/route/route.c
  lib/route/route_obj.c
  lib/route/route_utils.c
  lib/route/rtnl.c
  lib/route/rule.c
  lib/route/tc.c
  lib/socket.c
  lib/utils.c
  lib/version.c
  lib/xfrm/ae.c
  lib/xfrm/lifetime.c
  lib/xfrm/sa.c
  lib/xfrm/selector.c
  lib/xfrm/sp.c
  lib/xfrm/template.c
  src/genl-ctrl-list.c
  src/idiag-socket-details.c
  src/lib/addr.c
  src/lib/class.c
  src/lib/cls.c
  src/lib/ct.c
  src/lib/exp.c
  src/lib/link.c
  src/lib/neigh.c
  src/lib/qdisc.c
  src/lib/route.c
  src/lib/rule.c
  src/lib/tc.c
  src/lib/utils.c
  src/nf-ct-add.c
  src/nf-ct-events.c
  src/nf-ct-list.c
  src/nf-exp-add.c
  src/nf-exp-delete.c
  src/nf-exp-list.c
  src/nf-log.c
  src/nf-monitor.c
  src/nf-queue.c
  src/nl-addr-add.c
  src/nl-addr-delete.c
  src/nl-addr-list.c
  src/nl-class-add.c
  src/nl-class-delete.c
  src/nl-class-list.c
  src/nl-classid-lookup.c
  src/nl-cls-add.c
  src/nl-cls-delete.c
  src/nl-cls-list.c
  src/nl-fib-lookup.c
  src/nl-link-enslave.c
  src/nl-link-ifindex2name.c
  src/nl-link-list.c
  src/nl-link-name2ifindex.c
  src/nl-link-release.c
  src/nl-link-set.c
  src/nl-link-stats.c
  src/nl-list-caches.c
  src/nl-list-sockets.c
  src/nl-monitor.c
  src/nl-neigh-add.c
  src/nl-neigh-delete.c
  src/nl-neigh-list.c
  src/nl-neightbl-list.c
  src/nl-pktloc-lookup.c
  src/nl-qdisc-add.c
  src/nl-qdisc-delete.c
  src/nl-qdisc-list.c
  src/nl-route-add.c
  src/nl-route-delete.c
  src/nl-route-get.c
  src/nl-route-list.c
  src/nl-rule-list.c
  src/nl-tctree-list.c
  src/nl-util-addr.c
)

sed '1s#^#/* SPDX-License-Identifier: LGPL-2.1-only */\n#' "${FILES[@]}" -i

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/socket.c b/lib/socket.c
index 3c33bea..cfb0743 100644
--- a/lib/socket.c
+++ b/lib/socket.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
 /*
  * lib/socket.c		Netlink Socket
  *