a_iface: add missing static

src/libmsc/a_iface.c

@@ -292,7 +292,7 @@ static uint8_t convert_Abis_prev_to_A_pref(int radio)
 }
 
 /* Assemble the channel type field */
-int enc_channel_type(struct gsm0808_channel_type *ct, const struct gsm_mncc_bearer_cap *bc)
+static int enc_channel_type(struct gsm0808_channel_type *ct, const struct gsm_mncc_bearer_cap *bc)
 {
 	unsigned int i;
 	uint8_t sv;

src/libmsc/a_iface_bssap.c

@@ -71,7 +71,7 @@ static struct gsm_subscriber_connection *subscr_conn_allocate_a(struct a_conn_in
 
 /* Return an existing A subscriber connection record for the given
  * connection IDs, or return NULL if not found. */
-struct gsm_subscriber_connection *subscr_conn_lookup_a(const struct gsm_network *network, int conn_id)
+static struct gsm_subscriber_connection *subscr_conn_lookup_a(const struct gsm_network *network, int conn_id)
 {
 	struct gsm_subscriber_connection *conn;