disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/iio/dac/ad5791.h
..
..
@@ -1,9 +1,8 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * AD5791 SPI DAC driver
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  *
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  * Copyright 2011 Analog Devices Inc.
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- *
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- * Licensed under the GPL-2.
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  */
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 #ifndef SPI_AD5791_H_