Fix enabling of UMTS UEA encryption

The existing code allowed the user to configure UMTS encryption in the
vty, but we never actually passed this information down to RANAP.  As a
result, the RAN had no chance of ever enabling encryption on the air
interface.

Change-Id: Ieaaa6b23b7337b7edb902fad8031e195e0c5e9d2
Related: OS#4144
diff --git a/src/libmsc/msc_a.c b/src/libmsc/msc_a.c
index 9b6b602..fe3af14 100644
--- a/src/libmsc/msc_a.c
+++ b/src/libmsc/msc_a.c
@@ -348,6 +348,9 @@
 				/* for ran_a.c to store the GERAN key that is actually used */
 				.chosen_key = &msc_a->geran_encr,
 			},
+			.utran = {
+				.uea_encryption = net->uea_encryption
+			}
 		},
 	};
 
diff --git a/src/libmsc/ran_msg_iu.c b/src/libmsc/ran_msg_iu.c
index 5d13460..6120918 100644
--- a/src/libmsc/ran_msg_iu.c
+++ b/src/libmsc/ran_msg_iu.c
@@ -369,7 +369,7 @@
 
 	LOG_RAN_IU_ENC(caller_fi, LOGL_DEBUG, "Tx RANAP SECURITY MODE COMMAND to RNC, ik %s\n",
 			osmo_hexdump_nospc(cm->vec->ik, 16));
-	return ranap_new_msg_sec_mod_cmd(cm->vec->ik, NULL, RANAP_KeyStatus_new);
+	return ranap_new_msg_sec_mod_cmd(cm->vec->ik, cm->utran.uea_encryption ? cm->vec->ck : NULL, RANAP_KeyStatus_new);
 }