There is *no* guarantee that the "fd" argument to a dissector uniquely

identifies a frame; it may do so for Ethereal, which has to allocate a
data structure for each frame, but it doesn't do so for Tethereal, which
looks at a frame once and never does so again.

Use, instead, the "num" member of the structure to which "fd" points as
a unique identifier; it's the ordinal number of the frame within a
capture (frame number, not display row number, so it doesn't change as
the display is filtered), and is thus different for all frames.

svn path=/trunk/; revision=2213

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