Initialize ast_sockaddr before calling ast_sockaddr_resolve

Avoid possible jump based on unitialized value


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@340715 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -15345,7 +15345,7 @@ static void check_via(struct sip_pvt *p, struct sip_request *req)
 {
 	char via[512];
 	char *c, *maddr;
-	struct ast_sockaddr tmp;
+	struct ast_sockaddr tmp = { { 0, } };
 	uint16_t port;
 
 	ast_copy_string(via, get_header(req, "Via"), sizeof(via));