DCERPC (butc): fix warning: no previous prototype for ... [-Wmissing-prototypes]

Fix a typo in last patch and regenerate file

Change-Id: Id9083edd797af97d72a872187a0d0b5750e04547
Reviewed-on: https://code.wireshark.org/review/4453
Reviewed-by: Anders Broman <a.broman58@gmail.com>