low default connection errors level from alert to error

src/core/ngx_connection.c

diff --git a/src/core/ngx_connection.c b/src/core/ngx_connection.c
index 0a7fe84..01c2058 100644
--- a/src/core/ngx_connection.c
+++ b/src/core/ngx_connection.c
@@ -917,12 +917,8 @@
             level = NGX_LOG_INFO;
             break;
 
-        case NGX_ERROR_ERR:
-            level = NGX_LOG_ERR;
-            break;
-
         default:
-            level = NGX_LOG_ALERT;
+            level = NGX_LOG_ERR;
         }
 
     } else {