Remove a callback from an evbuffer, given a handle returned from evbuffer_add_cb.
Calling this function invalidates the handle.
@return 0 if a callback was removed, or -1 if no matching callback was found.
See Implementation
Remove a callback from an evbuffer, given a handle returned from evbuffer_add_cb.
Calling this function invalidates the handle.
@return 0 if a callback was removed, or -1 if no matching callback was found.