Add comment/cosmetics

src/input/input.c

@@ -904,8 +904,8 @@ static int Init( input_thread_t * p_input )
         var_Change( p_input, "length", VLC_VAR_SETVALUE, &val, NULL );
         UpdateItemLength( p_input, val.i_time );
     }
-    else if( p_input->p->input.p_item->i_duration > 0)
-        {
+    else if( p_input->p->input.p_item->i_duration > 0 )
+    { /* fallback: gets length from metadata */
         val.i_time = p_input->p->input.p_item->i_duration;
         var_Change( p_input, "length", VLC_VAR_SETVALUE, &val, NULL );
         UpdateItemLength( p_input, val.i_time );