bugfix: uninitialized fd might be closed

Author: tokers

ngx_http_zstd_filter_module.c

@@ -764,9 +764,8 @@ ngx_http_zstd_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
  ngx_conf_merge_bufs_value(conf->bufs, prev->bufs,
  (128 * 1024) / ngx_pagesize, ngx_pagesize);
 
-#if (NGX_SUPPRESS_WARN)
  buf = NULL;
-#endif
+ fd = -1;
 
  zmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_zstd_filter_module);
 
@@ -838,7 +837,7 @@ ngx_http_zstd_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
 
 close:
 
- if (ngx_close_file(fd) == NGX_FILE_ERROR) {
+ if (fd != NGX_INVALID_FILE && ngx_close_file(fd) == NGX_FILE_ERROR) {
  ngx_conf_log_error(NGX_LOG_EMERG, cf, ngx_errno,
  ngx_close_file_n "\"%s\" failed",
  zmcf->dict_file->data);