drm/vc4: hdmi: Silence pixel clock error on -EPROBE_DEFER

If the vc4 hdmi driver loads before the pixel clock is available we
see a spurious "*ERROR* Failed to get pixel clock" error.

Signed-off-by: James Hilliard <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/vc4/vc4_hdmi.c

···
 
 	hdmi->pixel_clock = devm_clk_get(dev, "pixel");
 	if (IS_ERR(hdmi->pixel_clock)) {
-		DRM_ERROR("Failed to get pixel clock\n");
-		return PTR_ERR(hdmi->pixel_clock);
+		ret = PTR_ERR(hdmi->pixel_clock);
+		if (ret != -EPROBE_DEFER)
+			DRM_ERROR("Failed to get pixel clock\n");
+		return ret;
 	}
 	hdmi->hsm_clock = devm_clk_get(dev, "hdmi");
 	if (IS_ERR(hdmi->hsm_clock)) {