return failure reason as "out" parameter from fse_stream_make
return failure reason as "out" parameter from fse_stream_make

During initial setup it is valid to directup update
root->failure_reason, but in the resync case, we don't want it to stick
in the root because we may treat that later on as a failure to recrawl.

facebook/watchman,kwlzn/watchman,nodakai/watchman,dhruvsinghal/watchman,facebook/watchman,dhruvsinghal/watchman,dhruvsinghal/watchman,wez/watchman,wez/watchman,wez/watchman,dhruvsinghal/watchman,dhruvsinghal/watchman,kwlzn/watchman,dhruvsinghal/watchman,kwlzn/watchman,nodakai/watchman,wez/watchman,dhruvsinghal/watchman,kwlzn/watchman,kwlzn/watchman,facebook/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,kwlzn/watchman,wez/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,wez/watchman,facebook/watchman,wez/watchman,kwlzn/watchman,dhruvsinghal/watchman,nodakai/watchman,facebook/watchman,wez/watchman,facebook/watchman,wez/watchman,nodakai/watchman,nodakai/watchman