[U-Boot] mmc: sdhci: Check that ops are defined

[Tom Rini]

On Mon, May 14, 2018 at 03:02:30PM +0300, Ramon Fried wrote:

> The check is necessary to avoid NULL pointer dereference.
> 
> Signed-off-by: Ramon Fried <ramon.fried at gmail.com>
> Reviewed-by: Michal Simek <michal.simek at xilinx.com>

Applied to u-boot/master, thanks!

-- 
Tom
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