avfilter/framepool: fix frame pool uninit check

Fixes a memory leak caused by AV_MEDIA_TYPE_VIDEO == 0 being excluded by
the !pool->type check. We can just remove the entire check because
av_buffer_pool_uninit() is already safe on NULL.

Fixes: fe2691b3bb
Reported-by: Kacper Michajłow <kasper93@gmail.com>
Signed-off-by: Niklas Haas <git@haasn.dev>

libavfilter/framepool.c

@@ -214,9 +214,6 @@ fail:
 
 av_cold void ff_frame_pool_uninit(FFFramePool *pool)
 {
-    if (!pool->type)
-        return;
-
     for (int i = 0; i < 4; i++)
         av_buffer_pool_uninit(&pool->pools[i]);