allocate less memory on 64-bit platforms

src/core/ngx_file.c

diff --git a/src/core/ngx_file.c b/src/core/ngx_file.c
index fa0e683..cef4dc1 100644
--- a/src/core/ngx_file.c
+++ b/src/core/ngx_file.c
@@ -44,7 +44,7 @@
     ngx_pool_cleanup_t       *cln;
     ngx_pool_cleanup_file_t  *clnf;
 
-    file->name.len = path->name.len + 1 + path->len + NGX_ATOMIC_T_LEN;
+    file->name.len = path->name.len + 1 + path->len + 10;
 
     file->name.data = ngx_palloc(pool, file->name.len + 1);
     if (file->name.data == NULL) {