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Check for valid parameters in check rate. Else, we end up getting errors. This occurs as part of the inital clock tree update of child clock nodes where new_rate could be 0 for non functional clocks. Fixes: 9ac33b0ce81fa48 (" CLK: TI: Driver for DRA7 ATL (Audio Tracking Logic)") Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Tero Kristo <t-kristo@ti.com>