The function trace_on_exit() is given to atexit() as a parameter, but
atexit() only takes a function pointer to a function with a void
parameter.
This problem was introduced when the on_exit() function was incompletely
replaced by atexit().
Fixes: ba6c8bd6142f ("linux-atm: add portability fixes")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
806354ab53