gprs_gmm.c: Perform LLME operations only if we have one

In case the GMM message did not arrive over a Gb interface, there is no
LLME (and thus the associated pointer is NULL).  Don't try to perform
operations on a NULL LLME.

Change-Id: If7f24161cd2826f8ee238d4bc1090adf555cea4e
1 file changed
tree: c1a905d3ca2403c0c17e8912a49eef74e5d41cf9
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview