nspawn: path_is_read_only_fs() may return negative errno

yuwata · yuwata · commit 27fce94ae6dc · 2021-06-12T03:19:08.000+09:00
And we usually assume /sys is not read only on error.
diff --git a/src/nspawn/nspawn-network.c b/src/nspawn/nspawn-network.c
@@ -469,7 +469,7 @@ int test_network_interface_initialized(const char *name) {
         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
         int r;
 
-        if (path_is_read_only_fs("/sys"))
+        if (path_is_read_only_fs("/sys") > 0)
                 return 0;
 
         /* udev should be around. */
