ARM: OMAP2+: Fix smatch found issue for omap_device

The patch d85a2d61: "ARM: OMAP2+: Populate legacy resources for
dma and smartreflex" from Oct 10, 2017, leads to the following Smatch
complaint:

arch/arm/mach-omap2/omap_device.c:453 omap_device_copy_resources()
         error: we previously assumed 'oh' could be null (see line 394)

Fixes: d85a2d61: ("ARM: OMAP2+: Populate legacy resources for dma
and smartreflex")
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/omap_device.c

@@ -391,10 +391,8 @@ omap_device_copy_resources(struct omap_hwmod *oh,
 	const char *name;
 	int error, irq = 0;
 
-	if (!oh || !oh->od || !oh->od->pdev) {
-		error = -EINVAL;
-		goto error;
-	}
+	if (!oh || !oh->od || !oh->od->pdev)
+		return -EINVAL;
 
 	np = oh->od->pdev->dev.of_node;
 	if (!np) {