disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/drivers/isdn/hardware/mISDN/Makefile
..
..
@@ -15,3 +15,5 @@
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 # chip modules
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 obj-$(CONFIG_MISDN_IPAC) += mISDNipac.o
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 obj-$(CONFIG_MISDN_ISAR) += mISDNisar.o
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+
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+obj-$(CONFIG_MISDN_HDLC) += isdnhdlc.o