proto_field_is_referenced

[mmann78 () netscape net]

Is proto_field_is_references still a valid function?

In looking at the intent, it either looks completely useless or should be used on almost all dissectors.  I was leaning 
more towards useless because I can't think of a scenario where tree (is already) != NULL, yet a dissector would be 
called without having its proto field referenced.

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