fix memory leak in long-lived non buffered connections

src/http/modules/ngx_http_memcached_module.c

diff --git a/src/http/modules/ngx_http_memcached_module.c b/src/http/modules/ngx_http_memcached_module.c
index 1f156cd..64592f3 100644
--- a/src/http/modules/ngx_http_memcached_module.c
+++ b/src/http/modules/ngx_http_memcached_module.c
@@ -461,6 +461,7 @@
     cl->buf->pos = last;
     b->last += bytes;
     cl->buf->last = b->last;
+    cl->buf->tag = u->output.tag;
 
     ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
                    "memcached filter bytes:%z size:%z length:%z rest:%z",

src/http/ngx_http_upstream.c

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index aedc504..a46b819 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -1937,6 +1937,7 @@
     cl->buf->pos = b->last;
     b->last += bytes;
     cl->buf->last = b->last;
+    cl->buf->tag = u->output.tag;
 
     if (u->length == NGX_MAX_SIZE_T_VALUE) {
         return NGX_OK;