perf callchain: Fix spelling mistake "statisitcs" -> "statistics"

There are a couple of spelling mistakes in perror messages. Fix them.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Cc: kernel-janitors@vger.kernel.org
Link: https://lore.kernel.org/r/20231027084633.1167530-1-colin.i.king@gmail.com


Signed-off-by: Namhyung Kim <namhyung@kernel.org>