drm: cleanup DRM_DEBUG() parameters

As DRM_DEBUG macro already prints out the __FUNCTION__ string (see
drivers/char/drm/drmP.h), it is not worth doing this again. At some
other places the ending "\n" was added.

airlied:- I cleaned up a few that this patch missed also

Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/mga_dma.c b/drivers/char/drm/mga_dma.c
index 9d95f60..c1d12dbf 100644
--- a/drivers/char/drm/mga_dma.c
+++ b/drivers/char/drm/mga_dma.c
@@ -1050,7 +1050,7 @@
 #if MGA_DMA_DEBUG
 		int ret = mga_do_wait_for_idle(dev_priv);
 		if (ret < 0)
-			DRM_INFO("%s: -EBUSY\n", __FUNCTION__);
+			DRM_INFO("-EBUSY\n");
 		return ret;
 #else
 		return mga_do_wait_for_idle(dev_priv);