mgcp: simplify getting msgb tail in mgcp_msg_terminate_nul()

The current statement:

  msg->l2h + msgb_l2len(msg)

looks as follows, if we expand the msgb_l2len():

  msg->l2h + msgb->tail - msg->l2h

so this is basically equal to msgb->tail alone.

Change-Id: I4f4b0f792bbeef94a5449c4a5843628a703a3d54
Related: CID#272990
1 file changed