PM / devfreq: Fix a index typo in trans_stat

[ Upstream commit 78c5845f ]

Fixes: 4920ee6d ("PM / devfreq: Convert to use sysfs_emit_at() API")
Signed-off-by: pls <pleasurefish@126.com>
Link: https://patchwork.kernel.org/project/linux-pm/patch/20250515143100.17849-1-chanwoo@kernel.org/


Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>