mgcp_client: Use INET6_ADDRSTRLEN to store addresses in str format

Warning: This breaks libosmo-mgcp-cli ABI!

Related: SYS#4915
Change-Id: Ib778e9a72764103b52a462ea3c7fb56b23c1bcd6
diff --git a/include/osmocom/mgcp_client/mgcp_client_fsm.h b/include/osmocom/mgcp_client/mgcp_client_fsm.h
index a1ebbb6..e315753 100644
--- a/include/osmocom/mgcp_client/mgcp_client_fsm.h
+++ b/include/osmocom/mgcp_client/mgcp_client_fsm.h
@@ -15,7 +15,7 @@
  *  sure it is correct. */
 struct mgcp_conn_peer {
 	/*! RTP connection IP-Address (optional, string e.g. "127.0.0.1") */
-	char addr[INET_ADDRSTRLEN];
+	char addr[INET6_ADDRSTRLEN];
 
 	/*! RTP connection IP-Port (optional)  */
 	uint16_t port;