Style.

src/event/ngx_event.c

diff --git a/src/event/ngx_event.c b/src/event/ngx_event.c
index 34a07e4..b8e0607 100644
--- a/src/event/ngx_event.c
+++ b/src/event/ngx_event.c
@@ -927,8 +927,9 @@
 
     *cf = pcf;
 
-    if (rv != NGX_CONF_OK)
+    if (rv != NGX_CONF_OK) {
         return rv;
+    }
 
     for (i = 0; ngx_modules[i]; i++) {
         if (ngx_modules[i]->type != NGX_EVENT_MODULE) {