selftests: bpf: correct perror strings
perror(str) is basically equivalent to print("%s: %s\n", str, strerror(errno)). New line or colon at the end of str is a mistake/breaks formatting. 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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