ARM: OMAP: DMA: Fix incorrect channel linking

Function enable_lnk does incorrect channel link on non-omap1 builds if chain
is created manually with omap_request_dma and omap_dma_link_lch functions.

Fix this by making sure that next_linked_ch field is initialized to -1 just
in omap_request_dma.
Signed-off-by: NJarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/plat-omap/dma.c

@@ -604,6 +604,7 @@ int omap_request_dma(int dev_id, const char *dev_name,
 	chan->data = data;
 #ifndef CONFIG_ARCH_OMAP1
 	chan->chain_id = -1;
+	chan->next_linked_ch = -1;
 #endif
 	chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 
@@ -1087,7 +1088,6 @@ int omap_request_dma_chain(int dev_id, const char *dev_name,
 			printk(KERN_ERR "omap_dma: Request failed %d\n", err);
 			return err;
 		}
-		dma_chan[channels[i]].next_linked_ch = -1;
 		dma_chan[channels[i]].prev_linked_ch = -1;
 		dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;