drm/radeon/r600: set correct pitch for 4 byte copy

[agd5f: also fix the non-kms path]

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
diff --git a/drivers/gpu/drm/radeon/r600_blit_kms.c b/drivers/gpu/drm/radeon/r600_blit_kms.c
index 0a6f468..acae33e 100644
--- a/drivers/gpu/drm/radeon/r600_blit_kms.c
+++ b/drivers/gpu/drm/radeon/r600_blit_kms.c
@@ -774,7 +774,7 @@
 
 			/* dst 23 */
 			set_render_target(rdev, COLOR_8_8_8_8,
-					  dst_x + cur_size, h,
+					  (dst_x + cur_size) / 4, h,
 					  dst_gpu_addr);
 
 			/* scissors 12  */