mgcp_rtp_end: Group statistics members into 'stats' sub-struct

Change-Id: I4e0ecdcd9a75fe08abc55b730780c01617f3d4af
diff --git a/include/osmocom/mgcp/mgcp_internal.h b/include/osmocom/mgcp/mgcp_internal.h
index 9e7246e..11bafe7 100644
--- a/include/osmocom/mgcp/mgcp_internal.h
+++ b/include/osmocom/mgcp/mgcp_internal.h
@@ -97,11 +97,14 @@
 
 struct mgcp_rtp_end {
 	/* statistics */
-	unsigned int packets_rx;
-	unsigned int octets_rx;
-	unsigned int packets_tx;
-	unsigned int octets_tx;
-	unsigned int dropped_packets;
+	struct {
+		unsigned int packets_rx;
+		unsigned int octets_rx;
+		unsigned int packets_tx;
+		unsigned int octets_tx;
+		unsigned int dropped_packets;
+	} stats;
+
 	struct in_addr addr;
 
 	/* in network byte order */