libbpf: remove unnecessary struct_ops prog validity check

libbpf ensures that BPF program references set in map->st_ops->progs[i]
during open phase are always valid STRUCT_OPS programs. This is done in
bpf_object__collect_st_ops_relos(). So there is no need to double-check
that in bpf_map__init_kern_struct_ops().

Simplify the code by removing unnecessary check. Also, we avoid using
local prog variable to keep code similar to the upcoming fix, which adds
similar logic in another part of bpf_map__init_kern_struct_ops().

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240507001335.1445325-2-andrii@kernel.org
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

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