Stylistic change in checking the boolean expression.

src/http/ngx_http_special_response.c

diff --git a/src/http/ngx_http_special_response.c b/src/http/ngx_http_special_response.c
index 0d66a4b..ea0378e 100644
--- a/src/http/ngx_http_special_response.c
+++ b/src/http/ngx_http_special_response.c
@@ -375,7 +375,7 @@
         }
     }
 
-    if (r->lingering_close == 1) {
+    if (r->lingering_close) {
         switch (error) {
             case NGX_HTTP_BAD_REQUEST:
             case NGX_HTTP_TO_HTTPS: