libbpf: Extract generic string hashing function for reuse
Calculating a hash of zero-terminated string is a common need when using hashmap, so extract it for reuse. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20200926011357.2366158-5-andriin@fb.com
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