Valid slew_rates indices are 0 through RT_ARRAY_SIZE(slew_rates) - 1.
The current check rejects only values greater than the table size,
allowing slew_idx == RT_ARRAY_SIZE(slew_rates) to index one element
past the table.
Generated-by: OpenAI Codex
Signed-off-by: Old-Ding <35417409+Old-Ding@users.noreply.github.com>