fix strncpy bugs in socket.c

Change-Id: Iddf36d26b23dcef4f9b291fd7ead1907e38c3486
diff --git a/src/socket.c b/src/socket.c
index 0405847..dc5590c 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -596,8 +596,7 @@
 		return -EINVAL;
 
 	local.sun_family = AF_UNIX;
-	strncpy(local.sun_path, socket_path, sizeof(local.sun_path));
-	local.sun_path[sizeof(local.sun_path) - 1] = '\0';
+	osmo_strlcpy(local.sun_path, socket_path, sizeof(local.sun_path));
 
 #if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
 	local.sun_len = strlen(local.sun_path);