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/mga_drv.h b/drivers/char/drm/mga_drv.h
index 49253af..7bf5911 100644
--- a/drivers/char/drm/mga_drv.h
+++ b/drivers/char/drm/mga_drv.h
@@ -245,7 +245,7 @@
 			    dev_priv->prim.high_mark ) {		\
 			if ( MGA_DMA_DEBUG )				\
 				DRM_INFO( "%s: wrap...\n", __FUNCTION__ );	\
-			return DRM_ERR(EBUSY);			\
+			return -EBUSY;			\
 		}							\
 	}								\
 } while (0)
@@ -256,7 +256,7 @@
 		if ( mga_do_wait_for_idle( dev_priv ) < 0 ) {		\
 			if ( MGA_DMA_DEBUG )				\
 				DRM_INFO( "%s: wrap...\n", __FUNCTION__ );	\
-			return DRM_ERR(EBUSY);			\
+			return -EBUSY;			\
 		}							\
 		mga_do_dma_wrap_end( dev_priv );			\
 	}								\