bpf: btf: Check array t->size
This patch ensures array's t->size is 0. The array size is decided by its individual elem's size and the number of elements. Hence, t->size is not used and it must be 0. A test case is added to test_btf.c Signed-off-by: NMartin KaFai Lau <kafai@fb.com> Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
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