ecore-drm: fix error check of _device_flags_set function

Summary: the function return -1 if it's failed so checking for ! is
incorrect. We should check if the return is less than zero.

@fix

Reviewers: gwanglim, devilhorns

Reviewed By: devilhorns

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D1682

src/lib/ecore_drm/ecore_drm_inputs.c

@@ -97,7 +97,7 @@ _cb_device_opened(void *data, const Eldbus_Message *msg, Eldbus_Pending *pending
         goto cleanup;
      }
 
-   if (!(fd = _device_flags_set(fd)))
+   if ((fd = _device_flags_set(fd)) < 0)
      {
         ERR("\tCould not set fd flags");
         goto release;