axe old unused alert message

src/os/unix/ngx_recv.c

diff --git a/src/os/unix/ngx_recv.c b/src/os/unix/ngx_recv.c
index 0342a99..6361b3c 100644
--- a/src/os/unix/ngx_recv.c
+++ b/src/os/unix/ngx_recv.c
@@ -78,12 +78,6 @@
                      * 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;
                 }