minor fix in the serving thread to avoid annoying message;

lib/sntllv2.c

@@ -705,6 +705,8 @@ static void *__sntll_thread(void *b)
     } else printf("connread(head) µS: %ld\n", end.tv_usec - beg.tv_usec);
 #endif
 
+    if(co->flags & SNSX_CLOSED) goto __finish; /* go away if required asap */
+
 #ifdef _VERBOSE_DEBUG
     dumphead(mhead);
 #endif