An earlier code state used the conn to lookup the transaction, but this is now
done by vsub. Hence the conn lookup is not used and not needed.
conn is no longer used since 36c44b2100,
change-Id I093f36d63e671e50e54fc6236e97a777cc6da77b,
"transaction: change arguments of trans_find_by_sm_rp_mr()"
Change-Id: Ia878d70138c883cb1a1d983516aff83efa6488ce
The need to pass a pointer to RAN connection in order to find
a transaction limits possible use cases of trans_find_by_sm_rp_mr(),
e.g. when we need to find a transaction, but RAN connection is not
established yet.
Moreover, the pointer to RAN connection was only used to obtain
pointers to gsm_network and vlr_subscr, so we can just
pass them directly.
Change-Id: I093f36d63e671e50e54fc6236e97a777cc6da77b
Neels Hofmeyr