kbuild: do not set -w for vmlinux.o modpost
The -w option is meaningless for the first pass of modpost (vmlinux.o).
We know there are unresolved symbols in vmlinux.o, hence we skip
check_exports() and other checks when mod->is_vmlinux is set.
See the following part in the for-loop.
if (mod->is_vmlinux || mod->from_dump)
continue;
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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