Gzip static: fixed NGX_CONF_FLAG misuse.

src/http/modules/ngx_http_gzip_static_module.c

diff --git a/src/http/modules/ngx_http_gzip_static_module.c b/src/http/modules/ngx_http_gzip_static_module.c
index 6e77761..1746e55 100644
--- a/src/http/modules/ngx_http_gzip_static_module.c
+++ b/src/http/modules/ngx_http_gzip_static_module.c
@@ -38,7 +38,7 @@
 static ngx_command_t  ngx_http_gzip_static_commands[] = {
 
     { ngx_string("gzip_static"),
-      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
       ngx_conf_set_enum_slot,
       NGX_HTTP_LOC_CONF_OFFSET,
       offsetof(ngx_http_gzip_static_conf_t, enable),