Revert to old ttyname_r behavior that when _ioctl() returns 0 (SUCCEEDED), return the buffer immediately.  This will permit ssh and/or PAM logins broken by previous commit.
Revert to old ttyname_r behavior that when _ioctl() returns 0 (SUCCEEDED),
return the buffer immediately.  This will permit ssh and/or PAM logins
broken by previous commit.

The (potential) underlying problem is still under investigation.

Point hat to:	me

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