dbri: check dma_alloc_coherent errors
Needs to check for dma_alloc_coherent() allocation failure.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
authored by FUJITA Tomonori and committed by David S. Miller be376649 1758ef68