perf timechart: Remove unused backtrace in trace_handler

Now the backtrace argument is not used in any handler.  Let's get rid of
it.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Namhyung Kim 2026-06-24 13:58:29 -07:00
commit 48d698f810