ARM: DaVinci: Emac: Fix edma_alloc_channel when any channel requested

Before this, if a "noevent" channel was in use, the code
would go into an infinite loop.
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-davinci/dma.c

@@ -492,6 +492,7 @@ int edma_alloc_channel(int channel,
 				return -ENOMEM;
 			if (!test_and_set_bit(channel, edma_inuse))
 				break;
+			channel++;
 		}
 	} else if (channel >= num_channels) {
 		return -EINVAL;