fbdev: omap2: Return clk_prepare_enable to transfer the error

Return clk_prepare_enable() in order to transfer the error if it fails.

Signed-off-by: Chen Ni <[e-mail]>
Signed-off-by: Helge Deller <[e-mail]>

drivers/video/fbdev/omap2/omapfb/dss/venc.c

···
 	if (r < 0)
 		return r;
 
-	clk_prepare_enable(venc.tv_dac_clk);
-
-	return 0;
+	return clk_prepare_enable(venc.tv_dac_clk);
 }
 
 static const struct dev_pm_ops venc_pm_ops = {