arq examples: adds assertions

Incidentally gets rid of dead initialization warnings from clang

Author: funman

examples/arq_rx.c

@@ -141,6 +141,7 @@ static int catch_udp(struct uprobe *uprobe, struct upipe *upipe,
         } else {
             const struct sockaddr_in *in = (const struct sockaddr_in*) s;
             addr_len = sizeof(*in);
+            assert(*len >= addr_len);
             memcpy(&addr, in, addr_len);
 
             upipe_dbg_va(upipe, "GOT NEW REMOTE: %s:%hu ",

examples/arq_tx.c

@@ -323,6 +323,7 @@ int main(int argc, char *argv[])
     struct upipe *upipe_rtcp_sub = upipe_void_alloc_output_sub(upipe_probe_uref,
         upipe_rtcpfb,
         uprobe_pfx_alloc(uprobe_use(logger), loglevel, "rtcp fb sub"));
+    assert(upipe_rtcp_sub);
 
     struct upipe_mgr *dup_mgr = upipe_dup_mgr_alloc();
     struct upipe *dup = upipe_void_alloc_output(upipe_rtcpfb, dup_mgr,