bpf: Fix order of args in call to bpf_map_kvcalloc

The original function call passed size of smap->bucket before the number of
buckets which raises the error 'calloc-transposed-args' on compilation.

Signed-off-by: Mohammad Shehar Yaar Tausif <sheharyaar48@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240516072411.42016-1-sheharyaar48@gmail.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>