[File] Don't count `\0` in string length

[Avinash Sonawane]

Hello!

At present, we count `\0` byte in string length for `desired_len` but
not for `result_len` (uses strlen).

So, on current master currently for every successful test `desired_len =
result_len + 1` but since we make comparison using strcmp we don't see
it (for successful test).

This patch correctly ignores `\0` while calculating `desired_len`.

Thanks!

Regards,
Avinash Sonawane (rootKea)
https://www.rootkea.me
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