mgcp log tweak: say RAN, not BTS, like surrounding logging

Change-Id: Ibb40155189a7f05ba2da4fcf9cf03fda5ffc3683
diff --git a/src/libmsc/msc_mgcp.c b/src/libmsc/msc_mgcp.c
index bf9ba93..71f36b3 100644
--- a/src/libmsc/msc_mgcp.c
+++ b/src/libmsc/msc_mgcp.c
@@ -375,7 +375,7 @@
 		return;
 	}
 
-	LOGPFSML(mgcp_ctx->fsm, LOGL_DEBUG, "CRCX/BTS: MGW responded with address %s:%u\n", r->audio_ip, r->audio_port);
+	LOGPFSML(mgcp_ctx->fsm, LOGL_DEBUG, "CRCX/RAN: MGW responded with address %s:%u\n", r->audio_ip, r->audio_port);
 
 	conn->rtp.local_port_ran = r->audio_port;
 	osmo_strlcpy(conn->rtp.local_addr_ran, r->audio_ip, sizeof(conn->rtp.local_addr_ran));