linux-phytec-fsl

mmc: mxs-mmc: Check for clk_prepare_enable() error

clk_prepare_enable() may fail and in this case we should propagate the error.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>