[multiple] minor: remove duplicated conditions

x-ref:
  "PVS-Studio Analysis Results"
  https://redmine.lighttpd.net/boards/3/topics/8459
  http://www.fly-server.ru/pvs-studio/lighttpd/

src/mod_cgi.c

@@ -620,10 +620,7 @@ static ssize_t cgi_write_file_chunk_mmap(server *srv, connection *con, int fd, c
 		}
 	}
 
-	if (r >= 0) {
-		chunkqueue_mark_written(cq, r);
-	}
-
+	chunkqueue_mark_written(cq, r);
 	return r;
 }
 

src/mod_wstunnel.c

@@ -884,7 +884,7 @@ handler_t mod_wstunnel_handshake_create_response(handler_ctx *hctx) {
         /* 8 bytes should have been sent with request
          * for draft-ietf-hybi-thewebsocketprotocol-00 */
         chunkqueue *cq = con->request_content_queue;
-        if (0 == hctx->hybivers && chunkqueue_length(cq) < 8)
+        if (chunkqueue_length(cq) < 8)
             return HANDLER_WAIT_FOR_EVENT;
       #endif /* _MOD_WEBSOCKET_SPEC_IETF_00_ */