dma: mv_xor: fix error handling for clocks
When a channel fails to initialize, we release all ressources, including clocks. However, a XOR unit is not necessarily associated to a clock (some variants of Marvell SoCs have a clock for XOR units, some don't), so we shouldn't unconditionally be releasing the clock. Instead, just like we do in the mv_xor_remove() function, we should check if one clock was found before releasing it. Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: NJason Cooper <jason@lakedaemon.net>
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