[sccp] Use msgb->l2h instead of msgb->data for CR

Using msgb->data only works as long as msgb->data == msgb->l2h.. In
the case of receiving a MSU unit from a E1 link, or even receiving
the IPA header we will have some non SCCP data at msgb->data and then
cast garbage to what we think is making sense..
Use msgb->l2h and everything is fine.
1 file changed
tree: e18e65cf9035252a977172302fd7f43a66735742
  1. hlrsync/
  2. linux-kernel/
  3. openbsc/
  4. rrlp-ephemeris/
  5. wireshark/