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/drm_ioctl.c b/drivers/char/drm/drm_ioctl.c
index b195e10..4eecfb9 100644
--- a/drivers/char/drm/drm_ioctl.c
+++ b/drivers/char/drm/drm_ioctl.c
@@ -123,7 +123,7 @@
 	 */
 	ret = sscanf(dev->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
 	if (ret != 3)
-		return DRM_ERR(EINVAL);
+		return -EINVAL;
 	domain = bus >> 8;
 	bus &= 0xff;