Fix potential segfault in sgsn_libgtp.c

* print pdp->address instead of mm->imsi if mm is NULL
* print mm->imsi in debug log (move it below NULL check)

Change-Id: I4fbf5a54019a46612fbc528d61120182738f9205
1 file changed
tree: ee561008faf592d5945b04a271b3cc75a7ccee49
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview
  6. .mailmap