wifi: rtw89: fix potential wrong mapping for pkt-offload

When driver fails to send H2C to firmware for pkt-offload, we should not
update the pkt_list of driver, and need to release allocated pkt index to
avoid wrong mapping between driver and firmware.

Signed-off-by: Chin-Yen Lee <timlee@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230123065401.14174-2-pkshih@realtek.com