Missing end-of-line backslash.

Change-Id: I99b72e4d38b12e0356f27d29f919484e40b7443b
Reviewed-on: https://code.wireshark.org/review/3287
Reviewed-by: Guy Harris <guy@alum.mit.edu>
(cherry picked from commit acea064009473637487585fb0cefc774f8323d42)
Reviewed-on: https://code.wireshark.org/review/3393