checking return values for pfiles.stp

[Erick Tryzelaar]

Good morning,

jistone on #systemtap helped me clean up pfiles.stp to make sure to
check return values when running pfiles.stp, which I've attached.
Also, would there be any possibility to promote any of pfiles's
functionality into a tapset? I find it pretty useful to be able to get
a filename for a given fd.

Thanks!
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