style fix: remove trailing spaces
diff --git a/src/core/ngx_string.c b/src/core/ngx_string.c
index 0385c96..93b713d 100644
--- a/src/core/ngx_string.c
+++ b/src/core/ngx_string.c
@@ -1354,15 +1354,15 @@
 
             case '<':
                 len += sizeof("&lt;") - 2;
-                break; 
+                break;
 
             case '>':
                 len += sizeof("&gt;") - 2;
-                break; 
+                break;
 
             case '&':
                 len += sizeof("&amp;") - 2;
-                break; 
+                break;
 
             default:
                 break;