mmc: dw_mmc: exynos: don't use if clock isn't available
Add checking whether the clock is valid. Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com> Acked-by: NJaehoon Chung <jh80.chung@samsung.com> Signed-off-by: NAlim Akhtar <alim.akhtar@samsung.com> Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
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