xwayland/eglstream: Demote EGLstream device warning

If no EGLstream capable device is found at startup, Xwayland's EGLstream
backend will log an error message "glamor: No eglstream capable devices
found".

However, considering that the vast majority of drivers do not implement
EGLstream, the lack of EGLstream capable device is more of the norm than
the exception.

Change the error message to a log verbose message.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Jonas Ådahl <jadahl@gmail.com>
(cherry picked from commit 96c82befa2)

hw/xwayland/xwayland-glamor-eglstream.c

@@ -1144,7 +1144,7 @@ xwl_eglstream_get_device(struct xwl_screen *xwl_screen)
     free(devices);
 out:
     if (!device)
-        ErrorF("glamor: No eglstream capable devices found\n");
+        LogMessageVerb(X_INFO, 3, "glamor: No eglstream capable devices found\n");
     return device;
 }