udp: Extract helper for selecting socket from reuseport group
Prepare for calling into reuseport from __udp4_lib_lookup as well. Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200717103536.397595-8-jakub@cloudflare.com
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