mmc: mtk-sd: check for valid optional memory resource
'top_base' memory region is optional. Check that the resource is valid before using it. This avoid getting a "invalid resource" error message printed by the kernel. Signed-off-by: Fabien Parent <fparent@baylibre.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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