reset looked at match

src/http/modules/ngx_http_sub_filter_module.c

diff --git a/src/http/modules/ngx_http_sub_filter_module.c b/src/http/modules/ngx_http_sub_filter_module.c
index 93d1b36..663a9f5 100644
--- a/src/http/modules/ngx_http_sub_filter_module.c
+++ b/src/http/modules/ngx_http_sub_filter_module.c
@@ -590,7 +590,7 @@
 
                 ctx->state = sub_start_state;
                 ctx->pos = p + 1;
-                ctx->looked = looked;
+                ctx->looked = 0;
                 ctx->copy_end = copy_end;
 
                 if (ctx->copy_start == NULL && copy_end) {