udptl: Ensure fec[] in udptl_build_packet() is initialized.

Scan results indicated that this array could be used uninitialized.  At a quick
look, it looks correct.  In any case, initializing it is a Good Thing (tm).
........

Merged revisions 359457 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 359458 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@359459 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/udptl.c

@@ -520,7 +520,7 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, unsigned int len)
 
 static int udptl_build_packet(struct ast_udptl *s, uint8_t *buf, unsigned int buflen, uint8_t *ifp, unsigned int ifp_len)
 {
-	uint8_t fec[LOCAL_FAX_MAX_DATAGRAM * 2];
+	uint8_t fec[LOCAL_FAX_MAX_DATAGRAM * 2] = { 0, };
 	int i;
 	int j;
 	int seq;