on_data_chunk_recv_callback can return NGHTTP2_ERR_PAUSE

[maru]

libmicrohttpd-http2/src/microhttpd/connection_http2.c

Lines 675 to 682 in 5f834d7

	/*
	* Can return NGHTTP2_ERR_PAUSE to make nghttp2_session_mem_recv() return
	* without processing further input bytes. The memory by pointed by
	* the data is retained until nghttp2_session_mem_recv() is called.
	* The application must retain the input bytes which was used to produce
	* the data parameter, because it may refer to the memory region included
	* in the input bytes.
	*/