brcmfmac: have sdio return -EIO when device communication is not possible
The bus interface functions txctl and rxctl may be used while the device can not be accessed, eg. upon driver .remove() callback. This patch will immediately return -EIO when this is the case which speeds up the module unload. Reviewed-by: NHante Meuleman <meuleman@broadcom.com> Reviewed-by: NFranky (Zhenhui) Lin <frankyl@broadcom.com> Reviewed-by: NPieter-Paul Giesberts <pieterpg@broadcom.com> Signed-off-by: NArend van Spriel <arend@broadcom.com> Signed-off-by: NKalle Valo <kvalo@codeaurora.org>
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