style fix: remove trailing spaces

src/http/ngx_http_header_filter_module.c

diff --git a/src/http/ngx_http_header_filter_module.c b/src/http/ngx_http_header_filter_module.c
index 543df21..e8d1ff1 100644
--- a/src/http/ngx_http_header_filter_module.c
+++ b/src/http/ngx_http_header_filter_module.c
@@ -247,7 +247,7 @@
             len += ngx_http_status_lines[status].len;
 
         } else if (status >= NGX_HTTP_BAD_REQUEST
-                   && status < NGX_HTTP_LAST_LEVEL_400) 
+                   && status < NGX_HTTP_LAST_LEVEL_400)
         {
             /* 4XX */
             status = status - NGX_HTTP_BAD_REQUEST