gprs_gmm.c: don't transmit NOTEXIST when mmctx is NULL

Add missing mmctx NULL check in gsm0408_rcv_gmm(). gsm48_tx_gmm_status() would
dereference mmctx without checking, so we can't call it if mmctx == NULL.

Follows up on recent e98ba82d2b07c835:
"gprs_gmm.c: Don't try to de-reference NULL mmctx".

Change-Id: If59efbde86c76ffe91a0b33be87273783a2a4a02
1 file changed
tree: f1a0ba9e49a9dca35a83b0271b8dbcf4462d68dd
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview