Add missing parameter to proto_tree_add_bytes_format_value()
tvb_lenght -> tvb_reported_length

Change-Id: Ibcb4a7caceaa8207877bdec0f770ad77f84dbe56
Reviewed-on: https://code.wireshark.org/review/3701
Reviewed-by: Anders Broman <a.broman58@gmail.com>