[PATCH] fix impossible case with waitpid(2) in truss

[Garrett Cooper]

Hi,
    waitpid(2) returns a value in the set { -1, 0, <pid> } (-1 in the
event of an ERROR, 0 when WNOHANG is specified, <pid> when the process
exits according to wait(2)); it never returns a value < -1.
    If someone could commit this patch it would be appreciated.
Thanks,
-Garrett
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