style fix: remove trailing spaces

src/core/ngx_file.c

diff --git a/src/core/ngx_file.c b/src/core/ngx_file.c
index 1c171f0..3efa900 100644
--- a/src/core/ngx_file.c
+++ b/src/core/ngx_file.c
@@ -428,7 +428,7 @@
     size_t      len;
     ngx_int_t   rc;
     ngx_err_t   err;
-    ngx_str_t   file, buf; 
+    ngx_str_t   file, buf;
     ngx_dir_t   dir;
 
     buf.len = 0;