imx: video: Fix return value issue

When framebuffer driver init is failed, we should return the err value not 0.
So the video init can exit immediately.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/video.c b/arch/arm/mach-imx/video.c
index b40ce53..953fe53 100644
--- a/arch/arm/mach-imx/video.c
+++ b/arch/arm/mach-imx/video.c
@@ -7,7 +7,7 @@
 int board_video_skip(void)
 {
 	int i;
-	int ret;
+	int ret = 0;
 	char const *panel = env_get("panel");
 
 	if (!panel) {
@@ -50,7 +50,7 @@
 		return -EINVAL;
 	}
 
-	return 0;
+	return ret;
 }
 
 #ifdef CONFIG_IMX_HDMI