pcu_connected(): constify parameter

Change-Id: I6d18ec0ad2bd6f71e0187ed70b03c3a2d0447f21

include/osmocom/bsc/pcu_if.h

@@ -15,7 +15,7 @@ struct pcu_sock_state {
 };
 
 /* Check if BTS has a PCU connection */
-bool pcu_connected(struct gsm_network *net);
+bool pcu_connected(const struct gsm_network *net);
 
 /* PCU relevant information has changed; Inform PCU (if connected) */
 void pcu_info_update(struct gsm_bts *bts);

src/osmo-bsc/pcu_sock.c

@@ -59,7 +59,7 @@ static const char *sapi_string[] = {
 	[PCU_IF_SAPI_PCH_DT] =	"PCH_DT",
 };
 
-bool pcu_connected(struct gsm_network *net)
+bool pcu_connected(const struct gsm_network *net)
 {
 	struct pcu_sock_state *state = net->pcu_state;