add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/testing/selftests/nsfs/pidns.c
..
..
@@ -27,7 +27,7 @@
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 #define __stack_aligned__	__attribute__((aligned(16)))
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 struct cr_clone_arg {
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 	char stack[128] __stack_aligned__;
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-	char stack_ptr[0];
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+	char stack_ptr[];
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 };
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 static int child(void *args)