disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/usb/audio.h
..
..
@@ -31,7 +31,6 @@
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 	int data[5];
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 	int (*set)(struct usb_audio_control *con, u8 cmd, int value);
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 	int (*get)(struct usb_audio_control *con, u8 cmd);
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-	void *context;
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 };
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 struct usb_audio_control_selector {