perf timechart: Remove unnecessary copy of backtrace

The pattern of strdup() and free() is found, and I think it just can
use the original backtrace directly.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Namhyung Kim 2026-06-24 13:58:30 -07:00
commit 780368ccd9