mgcp/rtp: Use SSRC in proper byte ordering

The ssrc has been used without respect to proper byte ordering in
mgcp_patch_and_count(). This only affected log messages.

This patch introduces a new variable 'ssrc' that takes the value of
the SSRC in proper byte order.

Sponsored-by: On-Waves ehf
diff --git a/openbsc/tests/mgcp/mgcp_test.c b/openbsc/tests/mgcp/mgcp_test.c
index 908773a..e5b8bbd 100644
--- a/openbsc/tests/mgcp/mgcp_test.c
+++ b/openbsc/tests/mgcp/mgcp_test.c
@@ -586,7 +586,7 @@
 
 		if (state.out_stream.ssrc != last_ssrc) {
 			printf("Output SSRC changed to %08x\n",
-			       ntohl(state.out_stream.ssrc));
+			       state.out_stream.ssrc);
 			last_ssrc = state.out_stream.ssrc;
 		}