mmc: sdhci-pxav2: add error handling of clk_prepare_enable()
There is no check if clk_prepare_enable() succeed in sdhci_pxav2_probe(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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