ARM: OMAP: fix error return code in omap1_system_dma_init()

Fix to return -ENOMEM in the d->chan alloc error handling
case instead of 0, as done elsewhere in this function.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/mach-omap1/dma.c

@@ -345,6 +345,7 @@ static int __init omap1_system_dma_init(void)
 		dev_err(&pdev->dev,
 			"%s: Memory allocation failed for d->chan!\n",
 			__func__);
+		ret = -ENOMEM;
 		goto exit_release_d;
 	}