[U-Boot] power: fix: Do not execute pmic command when not all necessary parameters are passed

[Tom Rini]

On Mon, Feb 24, 2014 at 01:33:08PM +0100, Łukasz Majewski wrote:

> Lack of this check resulted in a data abort when CPU tried to execute the
> following command (without further mandatory input): 'pmic MAX77686_PMIC'.
> 
> Only the 'pmic list' command requires one passed parameter.
> Other require at least two valid parameters for correct operation.
> 
> Signed-off-by: Lukasz Majewski <l.majewski at samsung.com>

Applied to u-boot/master, thanks!

-- 
Tom
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