Fixing Go program crash.
Fixing Go program crash.

Go request registration should be removed before C request memory freed.

C request address used as a key in Go map.  Freed memory can be instantly
reused for other request and older request registration should removed at this
point to avoid collisions.

nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit,nginx/unit