axe old unused alert message

src/os/unix/ngx_recv.c

@@ -78,12 +78,6 @@ ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size)
                      * even if kqueue reported about available data
                      */
 
-#if 0
-                    ngx_log_error(NGX_LOG_ALERT, c->log, 0,
-                                  "recv() returned 0 while kevent() reported "
-                                  "%d available bytes", rev->available);
-#endif
-
                     rev->eof = 1;
                     rev->available = 0;
                 }