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Currently if ${bootfile} is unset and sysboot is invoked with no filename specified then U-Boot will crash will a null-pointer dereference. Add the missing check and a matching error print. Fixes: 993c912d ("cmd: sysboot: Create a sysboot command dedicated file") Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
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