disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/drivers/staging/iio/resolver/Makefile
..
..
@@ -1,6 +1,6 @@
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+# SPDX-License-Identifier: GPL-2.0
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 #
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 # Makefile for Resolver/Synchro drivers
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 #
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-obj-$(CONFIG_AD2S90) += ad2s90.o
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 obj-$(CONFIG_AD2S1210) += ad2s1210.o