@prenotnull{clock_class}
@postrefcountsame{trace_class}
@postsuccessrefcountinc{clock_class}
-@post <strong>On success, if \p trace_class is frozen<strong>,
+@post <strong>On success, if \p trace_class is frozen</strong>,
\p clock_class is frozen.
@sa bt_ctf_trace_get_clock(): Returns the clock class contained in a