msm: sdio: Check card state before accessing sdio functions.
When there is a modem reset due to HW watchdog, the card structure
is removed. Hence check the card state before accessing any sdio
function including lpm_func.
Change-Id: Ia119cc4cb6439f82a547297e5886fac868b03ceb
Signed-off-by:
Venkat Gopalakrishnan <venkatg@codeaurora.org>
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