mtp_sap.h: Protect MTP_SIO macro params with parenthesis

Change-Id: I0ba8139fd5458ff3637eebaaba0d4c0edd080e6a
---
M include/osmocom/sigtran/mtp_sap.h
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/osmocom/sigtran/mtp_sap.h b/include/osmocom/sigtran/mtp_sap.h
index 05308c2..f13d6f1 100644
--- a/include/osmocom/sigtran/mtp_sap.h
+++ b/include/osmocom/sigtran/mtp_sap.h
@@ -32,7 +32,7 @@
 };
 
 /* ITU Q.704 14.2 Service information octet. See enum mtp_si_ni00 in mtp.h. */
-#define MTP_SIO(service, net_ind)	(((net_ind & 0x3) << 6) | (service & 0xF))
+#define MTP_SIO(service, net_ind)	((((net_ind) & 0x3) << 6) | ((service) & 0xF))
 
 struct osmo_mtp_transfer_param {
 	uint32_t opc;

