Clang diagnostics

Based on clang diagnostics:

1. lib/nl.c: recvmsgs(): nla filling with zeros commented.
2. lib/route/classid.c: & lib/route/pktloc.c:
   remove zero-filling of struct stat
3. lib/route/qdisc/htb.c: Fix htb_qdisc_msg_fill(): fix zero-filling
4. ematch/container.c: container_parse:
   commented why only 4 bytes are copied
   len marked as unused to eliminate compiler warning

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/nl.c b/lib/nl.c
index 5b37c2a3..2fa741f0 100644
--- a/lib/nl.c
+++ b/lib/nl.c
@@ -540,6 +540,12 @@ static int recvmsgs(struct nl_sock *sk, struct nl_cb *cb)
 	int n, err = 0, multipart = 0, interrupted = 0, nrecv = 0;
 	unsigned char *buf = NULL;
 	struct nlmsghdr *hdr;
+
+	/*
+	nla is passed on to not only to nl_recv() but may also be passed
+	to a function pointer provided by the caller which may or may not
+	initialize the variable. Thomas Graf.
+	*/
 	struct sockaddr_nl nla = {0};
 	struct nl_msg *msg = NULL;
 	struct ucred *creds = NULL;