bugfix: did't free ngx_regex_match_context.

Author: zhuizhuhaomeng

src/ngx_stream_lua_regex.c

@@ -511,6 +511,11 @@ ngx_stream_lua_regex_cleanup(void *data)
 
     if (ngx_regex_compile_context) {
         old_pool = ngx_stream_lua_pcre_malloc_init(NULL);
+        if (ngx_regex_match_context != NULL) {
+            pcre2_match_context_free(ngx_regex_match_context);
+            ngx_regex_match_context = NULL;
+        }
+
         pcre2_compile_context_free(ngx_regex_compile_context);
         ngx_regex_compile_context = NULL;
         ngx_stream_lua_pcre_malloc_done(old_pool);