[issue1983] Return from fork() is pid_t, not int

[Ryan Stutsman]

Ryan Stutsman added the comment:

> IIUC, HiStar is available in a 32-bit version,
> too, yet it may still use a 64-bit pid_t (Ryan, can
> you confirm whether that's the case?).

Great point.  pid_t is always 64-bit on HiStar.

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