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The DMA unmap API is not supposed to return value. Thus this patch changes the ipu6_mmu_unmap() as a void function and DMA unmapping didn't check the return value. Signed-off-by: Bingbu Cao <bingbu.cao@intel.com> [Sakari Ailus: Drop unnecessary returns.] Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>