BER: Code cleanup in call functions

Change-Id: I0ba958485dffd3cc1e419fb27cf7f2bc492d05fe
Reviewed-on: https://code.wireshark.org/review/4643
Petri-Dish: Anders Broman <a.broman58@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>