mgcp: Print both receivd and expected address in the error statement

The log statement is split into two because inet_ntoa works on an
internal buffer and would print the last address twice.
diff --git a/openbsc/src/libmgcp/mgcp_network.c b/openbsc/src/libmgcp/mgcp_network.c
index 03d0f35..eb8b736 100644
--- a/openbsc/src/libmgcp/mgcp_network.c
+++ b/openbsc/src/libmgcp/mgcp_network.c
@@ -344,8 +344,10 @@
 
 	if (memcmp(&addr.sin_addr, &endp->net_end.addr, sizeof(addr.sin_addr)) != 0) {
 		LOGP(DMGCP, LOGL_ERROR,
-			"Data from wrong address %s on 0x%x\n",
-			inet_ntoa(addr.sin_addr), ENDPOINT_NUMBER(endp));
+			"Endpoint 0x%x data from wrong address %s vs. ",
+			ENDPOINT_NUMBER(endp), inet_ntoa(addr.sin_addr));
+		LOGPC(DMGCP, LOGL_ERROR,
+			"%s\n", inet_ntoa(endp->net_end.addr));
 		return -1;
 	}