This code is used in Wireshark, not TShark; fix messages.

Change-Id: I3c6b7686de478e42eeeb9c51c8bdb5b6843666af
Reviewed-on: https://code.wireshark.org/review/5814
Reviewed-by: Guy Harris <guy@alum.mit.edu>
(cherry picked from commit db4232a69a0196c7cafab1afae9b2f45f58e4ebe)
Reviewed-on: https://code.wireshark.org/review/5815