constify some function arg pointers
Change-Id: I7a7560fad96719da01f1ee30eea0be0e52c60e99
diff --git a/include/osmocom/mgcp/mgcp_protocol.h b/include/osmocom/mgcp/mgcp_protocol.h
index abd264c..edd0554 100644
--- a/include/osmocom/mgcp/mgcp_protocol.h
+++ b/include/osmocom/mgcp/mgcp_protocol.h
@@ -23,5 +23,5 @@
void mgcp_rtp_end_config(struct mgcp_endpoint *endp, int expect_ssrc_change,
struct mgcp_rtp_end *rtp);
-uint32_t mgcp_rtp_packet_duration(struct mgcp_endpoint *endp,
- struct mgcp_rtp_end *rtp);
+uint32_t mgcp_rtp_packet_duration(const struct mgcp_endpoint *endp,
+ const struct mgcp_rtp_end *rtp);