VAAPI: va.c: use the requested amount of surfaces and examine the return result.

modules/codec/avcodec/va.c

@@ -83,7 +83,7 @@ static VASurfaceID *vlc_va_create_surfaces( vlc_va_conn_t *conn,
 
     int i_surface_count = num;
     VAStatus status = vaCreateSurfaces( conn->p_display, width, height, fourcc,
-                                        num, p_surfaces );
+                                        i_surface_count, p_surfaces );
     if( status != VA_STATUS_SUCCESS )
     {
         free( p_surfaces );