Removed trailing zero in WASI::fd_prestat_dir_name name return (for #3025)

[ptitSeb]

Description

Removed trailing zero in WASI::fd_prestat_dir_name returned name (for #3025)

[epilys]

Posix defines character strings as null terminated, personally I'd like all path strings that go out into a module to be null terminated. What do you think?

[ptitSeb]

I agree, but this is WASI here, not POSIX. check the ticket mentioned for more detail. Not sure the change should be done. But if we don't it, we should close the mentioned ticket as a "will not be done"

[ptitSeb]

bors r+

[bors[bot]]

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