gianfar: Fix DMA unmap invocations
We weren't unmapping DMA memory, which will break when gianfar gets used on systems with more than 32-bits of memory. Also, it's just plain wrong. Signed-off-by: NAndy Fleming <afleming@freescale.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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