[PATCH] wifi: ath10k: add extra output check in ath10k_wmi_event_debug_print()

[Kalle Valo]

Dmitry Antipov <dmantipov at yandex.ru> writes:

> In 'ath10k_wmi_event_debug_print()', passing skb of the very weird
> layout may produce debug output of the zero length. In such a case,
> 'if (skb->data[i - 1] == '\n')' will trigger an access beyond skb data
> boundaries. So fix this by adding an extra check whether at least one
> byte of the debug output was really emitted. Compile tested only.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Suggested-by: Fedor Pchelkin <pchelkin at ispras.ru>
> Signed-off-by: Dmitry Antipov <dmantipov at yandex.ru>

Adding ath10k list.

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