voipchat: print an error message when failing to send datagrams

Author: madebr

examples/voipchat.c

@@ -94,7 +94,9 @@ static void SendClientAudioToServer(void)
         ((Uint64 *) scratch_area)[0] = SDL_Swap64LE(0);  /* just being nice and leaving space in the buffer for the server to replace. */
         ((Uint64 *) scratch_area)[1] = SDL_Swap64LE(++next_idnum);
         SDL_Log("CLIENT: Sending %d new bytes to server at %s:%d...", br + extra, SDLNet_GetAddressString(server_addr), (int) server_port);
-        SDLNet_SendDatagram(sock, server_addr, server_port, scratch_area, br + extra);
+        if (SDLNet_SendDatagram(sock, server_addr, server_port, scratch_area, br + extra) < 0) {
+            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDLNet_SendDatagram failed: %s", SDL_GetError());
+        }
     }
 }