modify sin led gpio

hc

2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e

 kernel/drivers/video/fbdev/nvidia/nvidia.c
..
..
@@ -763,6 +763,8 @@
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 	int pitch, err = 0;
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 	NVTRACE_ENTER();
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+	if (!var->pixclock)
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+		return -EINVAL;
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 	var->transp.offset = 0;
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 	var->transp.length = 0;