disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/sound/usb/bcd2000/Makefile
..
..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 snd-bcd2000-y := bcd2000.o
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-obj-$(CONFIG_SND_BCD2000) += snd-bcd2000.o
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+obj-$(CONFIG_SND_BCD2000) += snd-bcd2000.o