selftests: bpf: test_sockmap: handle file creation failures gracefully
test_sockmap creates a temporary file to use for sendpage. this may fail for various reasons. Handle the error rather than segfault. Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: NSimon Horman <simon.horman@netronome.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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