fbdev: ep93xx-fb: fix return value check in ep93xxfb_probe

function clk_prepare_enable may fail in ep93xxfb_probe, therefore,
add a return value check to clk_prepare_enable and handle the
error.
Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@163.com>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/ep93xx-fb.c

@@ -548,7 +548,9 @@ static int ep93xxfb_probe(struct platform_device *pdev)
 	}
 
 	ep93xxfb_set_par(info);
-	clk_prepare_enable(fbi->clk);
+	err = clk_prepare_enable(fbi->clk);
+	if (err)
+		goto failed_check;
 
 	err = register_framebuffer(info);
 	if (err)