selftests/bpf: Introduce __attribute__((cleanup)) in create_pair()

Rewrite function to have (unneeded) socket descriptors automatically
close()d when leaving the scope. Make sure the "ownership" of fds is
correctly passed via take_fd(); i.e. descriptor returned to caller will
remain valid.

Reviewed-by: Jakub Sitnicki <[email protected]>
Tested-by: Jakub Sitnicki <[email protected]>
Suggested-by: Jakub Sitnicki <[email protected]>
Signed-off-by: Michal Luczaj <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin KaFai Lau <[email protected]>

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