Don't use "fd->pkt_len" when checking to see if you've run off the end

of the packet, use "pi.captured_len" - "fd->pkt_len" may include data
that isn't in the capture, due to a short snapshot length.

Don't use "fd->cap_len" when checking to see if you've run off the end
of the packe, use "pi.captured_len" - "fd->cap_len" isn't adjusted to
reflect any length fields, but "pi.captured_len" is (removing, for
example, Ethernet padding from the packet).

Use "END_OF_FRAME" rather than "pi.captured_len - offset", to make it a
bit clearer what's being done.

In the V.120 dissector, use "tvb_length()" when adding the top-level
protocol tree entry for V.120, as it's a tvbuffified dissector.

svn path=/trunk/; revision=2214

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