ath10k: sanitize tx ring index access properly
The tx ring index was immediately trimmed with a bitmask. This discarded the 0xFFFFFFFF error case (which theoretically can happen when a device is abruptly disconnected) and led to using an invalid tx ring index. This could lead to memory corruption. Signed-off-by: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
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