selftests/bpf: Fix map tests errno checks

Switching to libbpf 1.0 API broke test_lpm_map and test_lru_map as error
reporting changed. Instead of setting errno and returning -1 bpf calls
now return -Exxx directly.
Drop errno checks and look at return code directly.

Fixes: b858ba8c52b6 ("selftests/bpf: Use libbpf 1.0 API mode instead of RLIMIT_MEMLOCK")
Signed-off-by: Artem Savkov <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Reviewed-by: Yafang Shao <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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