after a call to nghttp2_session_mem_send_internal() which should set it, however in nghttp2_session_mem_send_internal() it is possible to return before setting the pointer. This change initializes the variable to NULL where delcared and sets the variable in nghttp2_session_mem_send_internal() to NULL before possibly returning rather than after. both options are not necessary but are both ideal practice
See README.rst
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