Get rid of separate rtp_port field

Let's use the port part of the struct mgcp_rtp_end->addr field instead
of keeping it separate. This makes it easier passing around and
using/checking the RTP remote address + port, and avoids confusion
having to check stuff outside of the address, with its port part
potentially unset.

Change-Id: I294eb5d85fae79bf62d36eb9e818426e187d442c
diff --git a/include/osmocom/mgcp/mgcp_network.h b/include/osmocom/mgcp/mgcp_network.h
index 854c92d..349ff94 100644
--- a/include/osmocom/mgcp/mgcp_network.h
+++ b/include/osmocom/mgcp/mgcp_network.h
@@ -93,7 +93,7 @@
 	struct osmo_sockaddr addr;
 
 	/* in network byte order */
-	int rtp_port, rtcp_port;
+	int rtcp_port;
 
 	/* currently selected audio codec */
 	struct mgcp_rtp_codec *codec;