smpp: Fix possible NULL dereference of the emse->acl

The esme->acl is treated like it can be NULL in other places
of the code. Assume it can be NULL during this check as well.

Dereference after null check (FORWARD_NULL)
9. var_deref_op: Dereferencing null pointer "esme->acl".

Fixes: Coverity CID 1042374
1 file changed
tree: 6c436cbab0ad04e29be86d568c4972f511e1912f
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. README