[PATCH] ath11k: add ieee80211_unregister_hw to avoid kernel crash caused by NULL pointer

[Kalle Valo]

Wen Gong <wgong at codeaurora.org> writes:

> When function return fail to __ath11k_mac_register after success called
> ieee80211_register_hw, then it set wiphy->dev.parent to NULL by
> SET_IEEE80211_DEV(ar->hw, NULL) in end of __ath11k_mac_register, then
> cfg80211_get_drvinfo will be called by below call stack, but the
> wiphy->dev.parent is NULL, so kernel crash.

[...]

> +err_unregister_hw:
> +		ieee80211_unregister_hw(ar->hw);
> +
>  err_free_if_combs:
>  	kfree(ar->hw->wiphy->iface_combinations[0].limits);
>  	kfree(ar->hw->wiphy->iface_combinations);

Incorrect indentation, I'm surprised checkpatch doesn't catch that. But
fixed this in the pending branch.

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