mpc512x/clock: fix clk_get logic

[Wolfram Sang]

> Sure I don't have major objections against your patch (though who is
> formally mpc512x maintainer to ack it ?),

Grant is maintainer for MPC5xxx.

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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