loop-util: call loop_device_make_internal() at the right place

The whole reason loop_device_make_internal() exists (as opposed to just
loop_device_make()) is to avoid mangling the loop flags value/call
getenv twice. Hence let's actually call it when we already mangled the
flags value.

src/shared/loop-util.c

@@ -695,7 +695,7 @@ int loop_device_make_by_path(
                   direct ? "enabled" : "disabled",
                   direct != (direct_flags != 0) ? " (O_DIRECT was requested but not supported)" : "");
 
-        return loop_device_make(fd, open_flags, 0, 0, loop_flags, ret);
+        return loop_device_make_internal(fd, open_flags, 0, 0, loop_flags, ret);
 }
 
 LoopDevice* loop_device_unref(LoopDevice *d) {