Fixed CPU hog while freeing hc->busy after e662cbf1b932 (1.11.11).
Fixed CPU hog while freeing hc->busy after e662cbf1b932 (1.11.11).

Reported by Richard Stanway,
http://mailman.nginx.org/pipermail/nginx/2017-March/053296.html.

firebase/nginx,firebase/nginx,firebase/nginx,firebase/nginx