Update a comment as per the previous commit.

Change-Id: Ic7adba4302d4d4abff7012cf09d68246ebade922
Reviewed-on: https://code.wireshark.org/review/4296
Reviewed-by: Guy Harris <guy@alum.mit.edu>
(cherry picked from commit 95dc9a927895db975e89bf3a65e4faf6ef28476b)
Reviewed-on: https://code.wireshark.org/review/4299