Bugfix: Memory leak in deletion of er_stack nodes of ERFilter.
Bugfix: Memory leak in deletion of er_stack nodes of ERFilter.

opencv/opencv,opencv/opencv,apavlenko/opencv,apavlenko/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,apavlenko/opencv