mgcp_client_test: use "\r\n\r\n" instead of "\n\n"

The separator between MGCP and SDP section is typically "\r\n\r\n". For some
reason the test so far used "\n\n" instead, rather use the standard separator.

Change-Id: I41c73722e5fae00663bcf96de0b57b7155809a06
diff --git a/tests/mgcp_client/mgcp_client_test.c b/tests/mgcp_client/mgcp_client_test.c
index 84ba3b4..4e7e0a7 100644
--- a/tests/mgcp_client/mgcp_client_test.c
+++ b/tests/mgcp_client/mgcp_client_test.c
@@ -149,7 +149,7 @@
 	trans_id = dummy_mgcp_send(msg);
 
 	reply_to(trans_id, 200, "OK",
-		"I: 1\n\n"
+		"I: 1\r\n\r\n"
 		"v=0\r\n"
 		"o=- 1 23 IN IP4 10.9.1.120\r\n"
 		"s=-\r\n"
@@ -336,7 +336,7 @@
 	OSMO_ASSERT(mgcp_client_cancel(mgcp, trans_id) == 0);
 
 	fprintf(stderr, "- late response gets discarded\n");
-	OSMO_ASSERT(reply_to(trans_id, 200, "OK", "I: 1\n\nv=0\r\n") == -ENOENT);
+	OSMO_ASSERT(reply_to(trans_id, 200, "OK", "I: 1\r\n\r\nv=0\r\n") == -ENOENT);
 
 	fprintf(stderr, "- canceling again does nothing\n");
 	OSMO_ASSERT(mgcp_client_cancel(mgcp, trans_id) == -ENOENT);