tree fcc42257641dd800702d89585bec2787ae016624
parent 7dde1f40a293dbac575b294f82ba905d8f45b7b7
author Neels Hofmeyr <neels@hofmeyr.de> 1590789481 +0200
committer Neels Hofmeyr <neels@hofmeyr.de> 1591791649 +0200

tlv.h: add msgb_tvl_put() to add a TvLV without the value part

So far, we have msgb_tl_put(), which allows putting the TL header of a TLV,
without the value part. Add the same for a variable-size length TvLV: put a TvL
header of a TvLV without the value part.

In a subsequent patch, osmo_mobile_identity will be introduced, which will
allow writing the encoded MI directly to the end of a msgb. For BSSGP_IE_IMSI,
which is a TvLV, it would hence be simplest to write only the TvL first.

Change-Id: I02cca5182fe42e40b63680a2fd470f03bcc11076