drm/ast: drop debug level on error printk

This was never an error, drop to a debug print.

Reported-by: Keven Lachance
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 7282c08..a712caf 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -841,7 +841,7 @@
 
 	ast->cursor_cache = obj;
 	ast->cursor_cache_gpu_addr = gpu_addr;
-	DRM_ERROR("pinned cursor cache at %llx\n", ast->cursor_cache_gpu_addr);
+	DRM_DEBUG_KMS("pinned cursor cache at %llx\n", ast->cursor_cache_gpu_addr);
 	return 0;
 fail:
 	return ret;