use ev->log, because ev->data may be connection stub only

src/event/modules/ngx_kqueue_module.c

diff --git a/src/event/modules/ngx_kqueue_module.c b/src/event/modules/ngx_kqueue_module.c
index c5fd6d8..9ef8bf2 100644
--- a/src/event/modules/ngx_kqueue_module.c
+++ b/src/event/modules/ngx_kqueue_module.c
@@ -409,7 +409,7 @@
 
     c = ev->data;
 
-    ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
+    ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
                    "kevent set event: %d: ft:%i fl:%04Xi",
                    c->fd, filter, flags);