sparc32: remove the call to dma_make_coherent in arch_dma_free

LEON only needs snooping when DMA accesses are not seen on the processor
bus.  Given that coherent allocations are mapped uncached this can't
happen for those allocations.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Andreas Larsson <andreas@gaisler.com>
Acked-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/ioport.c

@@ -361,7 +361,6 @@ void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
 	if (!sparc_dma_free_resource(cpu_addr, size))
 		return;
 
-	dma_make_coherent(dma_addr, size);
 	srmmu_unmapiorange((unsigned long)cpu_addr, size);
 	free_pages((unsigned long)phys_to_virt(dma_addr), get_order(size));
 }