drm: Remove DRM_ERR OS macro.

This was used to make all ioctl handlers return -errno on linux and errno on
*BSD.  Instead, just return -errno in shared code, and flip sign on return f
shared code to *BSD code.

Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/i830_dma.c b/drivers/char/drm/i830_dma.c
index dc20c1a..0bb1cbf 100644
--- a/drivers/char/drm/i830_dma.c
+++ b/drivers/char/drm/i830_dma.c
@@ -389,7 +389,7 @@
 		i830_dma_cleanup(dev);
 		DRM_ERROR("can not ioremap virtual address for"
 			  " ring buffer\n");
-		return DRM_ERR(ENOMEM);
+		return -ENOMEM;
 	}
 
 	dev_priv->ring.virtual_start = dev_priv->ring.map.handle;